How long would it take to get the visa and green card for myself who is married son of US based Citizen?

It will be a long wait. You can keep checking Visa bulletin on the Department of state website. In March, they are dealing with people who filed in...

What will be final status once we file H1-B

Your case will be governed by what is called "Last Action Rule".

Can H4 stay in US legally with expired I94 while H1 approval notice have not received ?

As long as the I-539 is filed before the expiration of her I-94, she can stay in the US.

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Can I apply H1 Extension (Premium) + H4 Extension + H4 EAD Renewal all in one go?

You can do that. That must have been mistake from the USCIS. A proper cover letter may help.

How can I convert my b1/b2 status to green card?

You need to consult with an immigration attorney and provide more information to check for possible options.

Then, what else can someone with b1/b2 do to get a green card?

There is no information to know anything about you. Therefore, it is impossible to suggest anything.

Hi there. I need to travel abroad. Can my husband send the advance perole card to me once he receives it at our address in US?

If you want to avoid any risks, please wait for your advance parole to be approved.

Waiting for RFE doc by mail since last 8 days

It is sent by snail mail. You should have it soon.

F4 Green card application filled in 1994. Please suggest if it can be resumed

I agree, you should consult an immigration attorney to get the facts analysed.

DACA RFE?

You can search for lawyer using "Find a lawyer".