You can call the FBI Criminal Justice Information Services (CJIS) Division at (304) 625-5590; choose that you are a private individual (as opposite of law enforcement) navigate the menu. They will ask you for your name and A#. Please note that they will not update anything regarding name check, just fingerprinting clearance status. In my case the lady said that they cleared it the same day they received it.
I have called FBI today and I was told that my results were submitted to USCIS on the same day. They didn't say anything like CLEARED or NOT CLEARED. Do I need to ask them the results?