H4-EAD filing

[MrNRI]

Hi

I recently switched from emp A to emp B. I have I-140 approved from emp A and as per the last update on the case I don't see it is revoked by emp A so far. 

Questions:

1. Is it possible to file H4-EAD for my spouse based on pervious emp A I-140?
2. Where can I get the process and documents required to file H4-EAD?
3. What is the current trend and what are the chances of H4-EAD being approved with current circumstances?

 

Thanks You