call IIO to find out
If AVM said "999 days", as IIO if FP received and quality is good
if AVM said "FP received, pending review", ask IIO if background check report is received and case is "ready to be assigned"
if AVM said "FP result received, process resumed", ask IIO if case assigned to an officer
If no clear answer from IIO, fax inquire to INS if you are really anxious.
I guess most of April RD cases have been approved now. So if you are still waiting, it\'s better to find out what has held up your case. But be ware not to call/fax too many times. It may sound suspicious and case RFE.