Based on other threads about rejection letters from years past we know they’re typically sent out around the 9th, and most arrive by the 15th. We know this year the letters were dated Jan 12th, so If I had to guess I would say the letters should have arrived around the 18th, which is in line with what those who have unfortunately recieved letters are saying. Covid is really good at messing shipping times up though, so I’d be extra cautious this year. I’d say if you haven’t heard anything by the 21st, then you’re like 90% safe.
here’s a link to the thread I’m refrencing
Personally, as someone sitting on a 3.78 weighted GPA and one semester C, I will be refreshing USPS informed delivery constantly for the next few days.