So I can't give a concrete answer, but from my experience, people were pulled off the waitlist at a much higher rate about 1-1.5 months before classes started last year. It seemed to be about 8-10 (that's a very rough estimate).
I applied for the VCU ABSN 2022 cohort and was waitlisted, but unfortunately never got pulled off. I had 4 pre reqs in progress at the time, but did notice some students say they were accepted and still had to complete some of their classes!
I did reapply and got accepted into the 2023 ABSN cohort. I wish you all the best of luck!