@BobVance, your fruit is Flavor Grenade, 100%. Regarding the ripening time, in my area some orchards start selling FG as early as second half of July (though fruit is still quite firm and underripe, similar to the one on your picture), and the main supply is in early-mid August. I personally prefer FG when the fruit are fully ripe, which means soft — for me the richness of flavor that the fruit develop at full ripeness is much more important than the crisp texture.
Based on what I see at local U-Pick orchards and farmer markets, the actual ripening date in CA is at least one month earlier (please see above). It seems like Dave Wilson's estimate is quite off the mark in this case.