My student interviewer got off the waitlist at Sinai and he said he got the email during the first week of April. For what he told me *the rumors* about the PhD waitlist, it's not impossible to get off (1-2 people/MTA) but everything is messed up now due to COVID. Also I personally would jump at the chance to go to Sinai so idk if there will be enough spots for waitlisted students. But it looks like you have three other choices at least so that's good! It's my dream to get a PhD and I'm three years out of undergrad with a good deal of research experience and Sinai is my only choice at this point...