Supplement J

I am currently on H1-B visa (valid until Dec 2021) and my Priority date is May 15, 2010, in EB2. I am working for employer A and I have recently applied for I-485/AOS in Oct 2020. Both EAD/AP are not approved yet and haven't received biometrics notice yet from USCIS. Kindly see below questions and advise.<br>

1) If I change to employer B after 180 days of filing I-485, how would USCIS know that I changed my employer if I do not file new I-485 J that's given by employer B?
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2 After getting EAD, can I stay without working for a few months? Is there a regulation that says that employment based I-485 applicant needs to work continuously after obtaining EAD?
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3) I am working for a consultancy company and recently changed my client who is not within 50-mile radius of the existing MSA. My current employer A is not planning to file H1-B amendment. In this case, if there is a site visit by USCIS officer and if they revoke H1-B, then am I still considered to be in legal status because I already applied for I-485 in Oct 2020? Am I safe to stay legally in USA in this scenario even though I did not receive EAD based on AOS?
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4) If H1B amendment/extension of an employee gets denied after filing AOS/I-485, is the employee still considered as in-status because of pending I-485?

I was working with employer A for 7 years on H1 B and they have filed Labor and I-140 with Priority Date 2014. Now I am on H4 EAD since 2019 and working for employer B for same role .
My Priority date was in filing date chart and my ex employer A agreed and filed my I-485 with form J on November 2020. Do I have to join my old Employer A now or it's fine if I join them after I-485 is Approved? If I don't join them now , will there be any problems in the 485 interview if I intent to join after I-485 approval ? Is it possible that employer B can file form J form after 180 days of I-485 receipt date without joining my old employer A considering my Priority date will be on the final action date after 4, 5 years .

1) My I-140 approved one Aug 2020. Filed I-485 in Oct 2020. Pending application less than 180 days No GC EAD yet. In this situation if my job is terminated for some reason, what will happen to my I-485 application ?
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2) After getting GC EAD and AP and before final action dates becomes current can I go outside USA and work for same employer who filed my I-485 or any other employers using EAD or needs to stay and work in USA until my GC is approved.?

I had my EB2 Interview last week it went good. I did submit my offer letter and my paystubs. I am still waiting to hear back from USCIS regarding the next steps. If I end up losing my job what happens in that event? I am working with my current employer on EAD and I dont have an active H1B. Its very difficult to find another job in the current situation, since I have already submitted an offer letter will they require any other confirmation before approving?

My H1B (6 years) was from 10/1/2004 - 9/30/2010 from 5 different companies.
Company A - PD(EB3) - Jun 19, 2007, I-140 applied on July 9, 2007, I-485 filed July 17, 2007 - got laid off Oct 31, 2008. - I-140 approved on Dec 29, 2008.
Moved to Canada in July 2012 and became Canadian Citizen in Apr 2017. I have been keeping Advance Parole active by visiting the USA every year.
Now I want to add my family in Canada(wife(Indian Citizen with USA visitors visa) and kid(Canadian Citizen)). Do you recommend AOS for myself and Consular Processing for my family?

How long does the supplement J form take for approval? What happens if supplement J is denied? Can I work with the new employer without filing supplement J?