Just got three email notices from USCIS for myself, wife and daughter that written notices have been mailed last Friday (06/15) that USCIS had registered our new permanent resident status. Have been waiting for almost 5 months (in tow more days), EB1 cases in TSC, no RFE.
One more thing is that we received first status update on 06/07 after the initial notice of I-485 in Jan., which changed the status from "Initial Review" to "Acceptance". Many people received this same update on their I-485 status which seems to be strange -- but it turns out to be that USCIS is processing your case in this situation.
Wish everyone good luck and get GC in time.