Yes likely based on the divorce it will be denied.

Yes you may file without your attorney.

Best to consult with your retained attorney for guidance.

About 6-8 months after the biometrics are completed but processing times vary.

Yes you may file an extension but decision is unclear given I130 pending application.

There is no fee for I765 or I131 if filed with underlying I485.

You can check but best to give them time and be patient.

No your sister must apply on our own in the appropriate consulate.

Yes he may be ineligible depending on his age.

No, you should wait for the I485 receipt to file I765.