Yes if you are not living together then that can impact the filing of a joint petition. Consult with an attorney for further guidance.

There is no specific timing for administrative processing but it often can go over 120 days.

What?

She will need a waiver of the joint filing requirement based on her good faith marriage and a properly filed divorce.

Is it ok to use my sister’s bank statement that is she going to fund me and my personal statement to issue a UK visa?

It would be best to consult with an immigration attorney who specializes in UK entry and visas.

I agree with my colleagues - if travel isn't imperative I would not advise travel given your previous history.

I am Brazilian and I changed my B1 visa to F1 here in the USA. Can I visit my country and come back to study?

You will need to apply for the student visa abroad regardless of whether you filed for the change of status in the U.S.

My my wife got arrested at my Uscis interview, however I got approved for 2 years.

It is most advisable to consult with an attorney in private to determine possible avenues for residency. Yes you can file for the removal of...

Allowed to work on B1/B2?

No, work is not authorized under a B1/B2 visa.

You do not need to schedule the appointment but rather you will receive notice of when it is scheduled at your local service center.

With a pending I485 you will be interviewed to prove that you meet the requirements for AOS and that your marriage was entered into in good faith.