So if you applied EA you will know your fate by end of January. The decisions are admit, postpone, deny. Yes some get denied.
If you are postponed, then you go into the RD pool with everyone else. There are many theories about this. It seems lots of students including OOS are postponed. Now you get to wait with everyone else till April to get your decision even if you originally applied EA. Once your postponed your no longer EA.
So now in April you are either accepted, denied or wait listed. Lots of people get wait listed.
If applying to Ross, you still have to be accepted to your home school first (ie:LSA, Engineering etc). So if your postponed in January you still have a good shot at Ross. Decisions are made from January to April. They haven’t released the schedule for next year yet. But it’s usually monthly after January.
Certain schools like Stamps have their own dates and requirements as above link.
My only advice is hang in there if your not notified in January. It’s a great school and worth the wait.