What are my options? Could my green card application still be approved? (Immigration)

Bring an I-864 and supporting docs from a different and willing financial co-sponsor to the interview.

What should I do/say when applying for citizenship regarding my marital status?

Even if separated physically you are still legally married and must answer that way on N-400 and at interview.

Who should write the cover letter foe removal of condition?

You dont necessarily need a cover letter - often it isnt looked at. Submit the forms with all joint marriage docs.

My husband received a criminal ticket "disorderly premise" after filling the i485.Would it impact the approval of AoS?

The criminal lawyer you hire should work with a competent Immigration Lawyer to make sure your husband doesnt jeopardize his green card case

How does a Green Card application via marriage for a non-Citizen going through the PERM process work?

If you are married before I -140 is filed her name would go on part of I-140. If not you could marry before I-485 filed and each file an I-485....

Not needed til I-130 is approved and sent to NVC - if your income is not enough you can use a co-sponsor

You can label it anything but the bottom line os you wont be approved until consulate has all requested docs and is satisfied.

Your accountant is right. You will be able to show immigration taxes filed as married starting 2021.

Have your lawyer explain what the purpose of the form is and how to complete in accordance with your desires.

You can renew your green card with maiden name. Maybe yoy also want to amend passport to maiden name as you are getting divorced from am abuser.