Can I expedite EAD Application?

The waiting period for those EADs is 3-6 months so you are almost there.

Existing USA, H1B Filing date and H1B clock reset?

You keep asking this question and that is why you are getting different answers. You have an immigration attorney who is being paid for all of this...

The OPT is not impacted by filing the marriage case and it is the only way you can work until you get the marriage EAD.

Your unauthorized employment should not impact your case but it is definitely an employer's sanction violation for the employer.

Is it recommended to wait some time before changing employer (H1b) after you receive your EAD through marriage?

You have at least one immigration attorney being paid to represent you; you should speak to him/her. Your H-1 status has nothing at all to do with...

How much time it may take if L2 apply for conversion to F1 while in US vrs going back to home country and applying for F1?

It is unlikely you will get an F-1 visa at the US consulate if I understand these facts correctly. You have an immigration attorney already so...

My I485 Pd has became current in Nov 2019. This is December 2019, I am yet to hear from USCIS. What could be the issue?

It has only been one month. You are expecting too much, too soon from CIS.

When can my wife with R2 status file for green card?

It is difficult to understand this question. R-2s cannot file for green cards. R-1s can file for a green card after they have worked full-time for...

What visa class will be applicable to spouse of permanent resident after I-824 approval?

It is under your category, EB-2, and is called “follow to join “. This assumes that your marriage occurred before your adjustment of status was...

Am I us citizen?

Yes, you do need help and should consult with a Board Certified immigration attorney quickly. Good luck.