What exactly do you need to use it for? The SSN remains valid even if you have departed, it is ultimately tied to the Social Security...

They can file an e-request for non-delivery of notice and I have recently been receiving responses fairly quickly. They can also use the account...

What is my "current income"?

Current income is your income with the new job, it doesn't matter that you just started working there, as it is your current job. Include at least...

No, she cannot work on an H4 EAD if you quit and depart. Your wife's status is a dependent status and directly tied to you maintaining your status.

Nvc other one required documents review time?

It can take weeks before the NVC declares the case documentarily qualified. Make sure you've uploaded clear copies of all documents.

Can I apply for H4 visa from Toronto?

As long as you two are married, you can apply for the H4 visa in Canada based on your spouse who holds a valid H1B.

From the information you've given, you can file the I485 through your employer so long as you have an approved I140 and priority date is current....

Anything to do for finalizing i130 process?

You can continue to follow up, but unfortunately RFE's can take months to process and can significantly delay processing of a case.

If I travel out of US during H4 Cos (from L2), will my 1539 be invalidated. Will my kids I539 A be invalidated?

Your change of status will be considered abandoned if you depart.

What does nvc do when we notify them that a child is going to turn 21 soon?

You should consult an attorney who can do a CSPA calculation if necessary. Perhaps the child is not aging out according to the CSPA. You can notify...