September 1st is the typical ripening time. There is a large group that ripens in September. This chart and descriptions will help https://www.foodforestnursery.com/growing-guides/fruit-trees/pear-tree-growing-guide/when-are-pears-in-season/
Yes it does ripen before harrow sweet by 1-3 weeks.
“Early Season Pears
Typically ripening in late summer, early season pears are known for their crisp texture and refreshing taste, making them ideal for warm-weather snacking. Because they have a shorter shelf life than late-season varieties, timely harvesting is essential to enjoy their peak flavor.
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LeConte Pear (Early July – Late Aug): Features an exceptionally smooth texture and rich sweetness; perfect for fresh eating and summer desserts.
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Pineapple Pear (Early July – Late Aug): Retains its tangy flavor and firm, coarse texture well; a favorite for baked goods and preserves.
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Summercrisp Pear (Early Aug – Mid Aug): Prized for its refreshingly crisp bite and sweet flavor; a top choice for summertime salads.
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Sunrise Pear (Mid Aug – Late Aug): Known for juicy flesh and a balanced sweet-tart taste; offers culinary versatility for snacking or desserts.
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Monterrey Pear (Early Aug – Mid Sept): Offers a mild, buttery sweetness; a flexible ingredient for both sweet and savory dishes.
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Warren Pear (Early Aug – Mid Aug): Renowned for deep, spicy flavor and a buttery, smooth texture; preferred for its fresh taste and fire blight resistance.
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Ayers Pear (Mid Aug – Early Sept): Cherished for creamy, sweet, and juicy flesh; offers a decadently moist bite.
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Moonglow Pear (Mid Aug – Early Sept): Soft, juicy, and subtly sweet; an excellent choice for those who prefer a milder flavor.
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Hosui Asian Pear (Late Aug – Early Sept): Features distinctive crispness and intense honey-like sweetness; often enjoyed fresh as a succulent snack.
Late Season Pears
As the weather cools, late-season varieties ripen with richer and more complex flavor profiles. These pears tend to store well, making them ideal for holiday dishes and winter storage.
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Ooharabeni Asian Pear (Late Aug – Early Sept): Characterized by vibrant color and a crisp texture paired with a subtly nuanced sweetness.
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Chojuro Asian Pear (Early Aug – Mid Sept): Noted for its rich, butterscotch-like sweetness and a satisfyingly crisp texture.
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Bartlett Pear (Late Aug – Early Sept): Famous for its juicy, sweet flesh; versatile for raw applications and various cooking methods.
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Shinseiki Asian Pear (Late Aug – Early Sept): Known for a refreshingly crisp bite and a well-balanced combination of sweetness and tartness.
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Orient Pear (Mid Aug – Mid Sept): Stands out for its large, round shape and a firm texture that holds up well for canning.
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Peggy Asian Pear (Late Aug – Early Sept): Cherished for a juicy crunch and delicate sweetness; refreshing for fresh snacking and salads.
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20th Century Asian Pear (Late Aug – Mid Sept): A crowd-pleaser with a refreshingly crisp texture and an enjoyable sweet-tart balance.
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Shinko Asian Pear (Early Sept – Late Sept): Boasts a rich sweetness and a firm, substantial bite.
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Kieffer Pear (Early Sept – Mid Oct): Features a notably crisp, coarse texture; a sturdy fruit perfect for cooking, canning, and long-term storage.
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Large seckel ripen september also between August 20th - early September seckel ripens. Leconte ripen very early like harrow delight in late July/ August depending on location.Grandpas nursery has a nice chart as well.
@Fusion_power put together this guide that can be pieced together to help with the future info you need. It won’t have the actual info you wanted above though you can get some good info there he acquired by scraping websites. In a few years he will have more hands on data as he has 120 pears in the ground which is a start in the right direction on acquiring the hands on data. He is making large moves towards a large experimental Pear orchard. It is very impressive. He will be up to 1000 types in 10 years at that rate. It took me nearly 40 years to do the same amount of research on pears as that. He will get it done in 20 years at the rate he is going. Some pears take over 10 years to mature.