As long as your plants do well hardening off outside they should be fine to plant, they should be acclimated to full sunlight and reduced watering for 10 days or more; so that there is not much soft new growth. A little sunburn or occasional wilting is nothing to worry about during that time of adjustment, tough love. And it would be ideal if the roots have filled the container, not really necessary though if you are careful.
We’ve just entered into the ideal planting window for actively growing trees here, it runs until mid July. If you have any Surround that can help with heat stress after planting, I am pretty tough on them though and usually bare root ~3 month old plants and then plant through hot black ground cover, the leaves get a little crispy but they have all done OK.
Just regular water during dry periods until late August and mulch or use ground cover for weeds, add a little compost if you really want them to take off. If you will be bending to the ground to cover for winter plant on an angle to make it easier.