Just want to share my experience:
Both hu*****and & wife 485 submitted: 2/2003
Both hu*****and & wife 1st FP: 7/2003
Hu*****and 485 approved 8/2004
RFE for wife: 8/2004
Wife 2nd FP: 11/2004
Wife EAD submitted: 1/2005
Wife EAD approved; 2/22/2005
Wife 485 approved; 2/23/2005