回複：pending I140 and job changed, should I update my new address

You should update you new address in 10 days.Your situation is critical.If you tell the truth,you are worried about REF.But you should know that if you don't update and USCIS know the facts in the future,your immigration would fail.
It is over 180 days since you submitted I-140 and I-485,I don't think you have a big issue if you previous employer agree to reply for REF.