回複：My wife's EAD got approved after I ted the RFE to NSC. Doe

EAD application is only associated with the I-485. The approval of your wife's EAD does not mean anything about whether your I-140 is approved. As long as your wife has a pending I-485 application (meaning that your I-140 is either pending or approved), her EAD application will be processed and remain valid.