Are UA admissions decisions made in "rounds"? If so, what frequency?

@mom2collegekids I see from the acceptance Class of '21 thread that the first round of acceptances were posted on 9/6. I looked at last year’s similar thread for Class of '20 - and it appears that admissions decisions are posted about weekly? Is this an accurate observation? My S’s high school took a while to send transcript. It posted today in mybama. Any chance there will be another round of decisions tomorrow - and that he might be in that group? any insight? THANKS