GO BY MAIL...
I AM SURE U WILL GET your 485 APPROVED WITHIN ONE WEEK OF THEM RECEIVING UR EAD APPLICATION....
It has worked for hundreds..
First complete UR FP...Bcos, if UR FP is not current then, the EAD application will not help..
Hence Do UR FP on 1 Apr- Call FBI and confirm on 3rd and then mail UR application on 4th....