When you received FP letter?
Thanks. I guess you received your FP letter in April in order to do FP in May. This means NSC was processing cases which were to be current half month before the visa actually becomes current.
My 485 RD is a little later than yours, but I have not received any FP notice. I think your case will be processed soon, and I have to wait for some time.
Please share info when your case gets approved.