When i get H1B approval from USCIS, is there a particular time period within which i should exit the US and get stamping?

Did the approval include a change-of-status and a new I-94? If so, you don't ever have to leave the US if you don't want to. Stamping is only...

-When NVC notifies that visa case has been opened based on I-130 approval, does it mean a visa is expected to be available soon?

I believe that if you/they read the notice closely it doesn't say "case has been opened" ... rather it probably state that there is a "case...

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If a conditional green card holder becomes a joint sponsor, does it affect his future LPR processing?

Mr Esparza make a good point ... the possibility of a delay for your friend's greencard application if your I-751 is pending.

Sorry, the answer is no. People on DACA no longer qualify for Advance Parole.

Will the Covid-19 pandemic weaken my I-130 case for my husband?

you forgot to tell us if you are a US citizen or not.

Can a conditional green card holder be a joint sponsor for marriage-based green card application?

Yes, your friend can be a joint sponsor. But, it would be better if a LPR or US citizen filed the 864.

Can I work with an expired H4 EAD?

No, that is absolutely forbidden ... sorry.

Hi I came over on a h2b visa its expired now can I apply for the the investor's visa eb5 Visa

If your H-2B I-94 is expired, you must leave the US before you are able to tile the EB-5.

H visas are allowed an additional 10 days to depart the US thus the May 20th/30th difference. I don't know who told you to e-file ... I NEVER...

Immigration..Your benefit request has been accepted and is under review.” From USCIS for my I-130. What does that mean ??

It means exactly what it states ... they are reviewing the I-130.