From what I’ve seen on this page it looks like they almost always send out:
1. Pre interview rejection
2. Interview invite
3. Acceptance within a few weeks/month of interview (pre holidays it was 5-6 weeks, but post New Years it looks like they’re sent on fridays 3 weeks post interview)
It seems like after you interview if you don’t get accepted shortly after then you don’t hear anything. They rarely sent out post interview rejections/waitlist. So I guess that’s kind of a pre waitlist? I know on my interview day they said they were very conservative with acceptances because of the small class size and if you don’t hear back within a few weeks then you’re waiting until April no matter when you interviewed. But that probably means there will be a good amount of movement in April!