體檢表RFE已遞交2月多，請問8老師485什麽時候能批下來

I have an NIW approved on 2014. The PD is Feb, 2014. Later I got my eb1a approved on Dec, 2016. The PD is March, 2016. 

When I submitted my i485, I used the PD on Feb, 2014. Now, My employee just extended my H1b for another 3 years.