Can the beneficiary move to the US (she has a non-immigrant visa) and change her address so that her case is moved to the US ?

This is not a good idea .. you are so close to getting the visa, why do you want to take a short-cut and try to get around the system. Plus,...

Filed my mom' green card application and I got a response from USCIS about the I-485- income dint meet 125% federal poverty

Actually it is the I-864 that they didn't like. Talk to an attorney if you believe that your income is 'enough'.

F-1 Student selected status as "Single" in the form I-765, although I was married before, is that an issue?

You should be OK as long as you told the truth on your DS-160 applications.

It takes about 2-3 years for the numbers to become current.

How do I find out the value of my msa my case settel1 with 100% permanent disability and future medical ?

This is not an immigration question ... I tried to re-classify.

Hi, I changed from Client A to Client B in Feb 2019 within the same MSA but my LCA was posted in September 2019 ?

Yes, if the Consulate investigates, there could be a problem. CIS is cracking down on 'job shops'.

How long will it take to get a response/approval which I’m hopeful for ?

You need an attorney. You should have considered filing a new I-485 .. it would have been faster ... especially if the I*-130 had been approved.

How to find a lawyer to follow up on the status of my J1 visa which has been in Administrative Processing for over six months?

Yes, an attorney might help. What is your nationality? Specifically, what type of J was it for?

What is the best way for my EB2 husband to get green card through marriage? I am US citizen?

Yes, this would be processed as a 'regular' marriage case I-130/485/765/864/131.

When our visa will be issued?

What type of visa did you apply for? What Consulate has the case?