It really depends on your stats/EC's. If you have good stats/EC's, then you'll be invited to an interview, even if you didn't apply super early. If you have mediocre stats, best to apply early.
Also, I believe you can't use the academic update until September in AACOMAS. Your GPA will be locked until then. That's why I said it is imperative to know how well you think you'll do in your summer classes. If you do well, then submit after you get those grades from summer classes.