I-765 (EAD) gives the intending immigrant an opportunity to work while waiting for their I-485 to be adjudicated. You’re waiting for movement on I-485 and for the interview to be scheduled.
You should have provided proof of bonafide marriage with I-485. If your I-485 case number starts with IOE (electronic case), then you can upload marital evidence in the account when it’s linked to the case. If not, then either USCIS will issue an RFE for that or you will bring that evidence to the I-485 interview.