A question about 485 file

I recently learn from CIS website that my I140 NIW has been
approved. But as I moved and changed the address, I didn't receive the
official approval letter. Do you think if I can proceed to adjust my
status of I485 without obtaining the official notice of action, or should
I call them and try to get the letter first?(I still don't know what to do
to get the letter).
Thank you very much. Happy thanksgiving.