I submitted my biannual 3rd class medical plus all my SI paperwork the first week of November. Mine expired 11/30/21. Previous annual SI submittals have gone smoothly and usually 1 month. I've been doing SIs for 5 years now. I've called the FAA office in ATL and they confirmed all paperwork received, no more required. They indicated it's waiting physician review. Hearing 3 to 4 months delay now from Aopa.