Add to that list that I just received a new request for a fresh PCC.Nice - I hope that means PPR very soon.
I also received a GU in the last 2 hours.
Similar timeline to you:
AOR August 2020.
Mar 11 received ADR for Schedule A
Mar 14 submitted Schedule A
Mar 15 received email acknowledgement of Sch A receipt (also received message within account portal that meds are "approved" on Mar 15. Weird because I haven't done any meds in a long time.)
Mar 21 (today) - IP2 (I think?) - have a GU showing that IRCC is now "processing your background check"