H1B to H4 COS, received I797C saying case approved , but not I797A



We had filed for my spouse’s H1B to H4 about 2 months back, and had received I797C receipt.

Today we received another I797C saying case approved, and that this was only a courtesy copy, and the original approval notice will be mailed to the mailing address mentioned on G28.

It has been about 10 days and we haven’t received I797A yet. How long does this take usually ?

I asked my attorney , and they say that I797A will also be mailed to us and not them.