The employer should submit what was required in the RFE. CIS probably wants to check if they’ve complied / are complying.

Do u think that they can extend visa ?

The more extensions you file, the harder it is to win. But if you have reasons for doing so, and establish your intention to go home, then it...

Green card pending over 2 years and I'm separate from my wife now. what i should do? wait or get divorced

They will deny it if you are separated or if you get divorced before the interview.

Should I answer yes to "Have you ever been refused a US visa on DS 260?"

Yes. You were also an IV applicant back In 2011 so the answer is yes.

Original I-130 was not mailed, should I file a new I-130 or or file I-824? Are these two compatible? Which one is quicker?

824. The I-130 was already approved so no need to file a new one.

Do I have to be physically in USA if my american wife is living in Germany and she CAN NOT be alone based on her psychologist?

Do an I-131 and gather evidence of her psychologists advice for your future citizenship application (rebuttable presumption possible issue).

Selected as the best answer

Can I update my recent visa stamping & I-94 'admit until' dates w/ my new H1B extension/I797a date and, if so, how?

No need to unless you leave the country.

Can a non American get married to a Canadian and get permanent stay in America ?

No. Have to get married to a US Citizen.

After 2 months of interview I did not receive any response. I don know what that is meaning?

Sometimes it takes longer than usual.

Should I get help from an immigration lawyer for a green card?

2 publications may not cut it for NIW.