Can my H-1B be filed as concurrent employment on my wife's H-4 EAD?

You cannot get a labor certification/permanent residence through your wife's company.

Waivers and process question

That is not the best strategy. Both waivers require proving hardship and their is no strategic advantage to waiting.

Can I apply immediately after she arrives in USA or is there a minimum time she needs to stay here before I can apply? Thanks!

You need to consult with a Board Certified immigration attorney before you get you and your mother in serious trouble.

Should I gather any documents from Employer A before leaving job which might be required for remaining GC process?

You should have a complete copy of your file from your immigration attorney.

Assuming we get our i485 approved, is there a way to keep her greencard valid while she is working abroad in India.

These questions need to be answered by your attorney. AVVO is for people who do not have attorneys. And your plan is the best for several reasons,...

I have been in the USA on a work permit for more than 5 years am I eligible for citizenship ?

You generally have to be a permanent resident for five years to be eligible to apply for citizenship. Wot authorization is not status of any kind.

What restrictions on eligibility for adjustment of status depending on when immigration petition was filed mean?

As a general rule crewmen are not eligible to adjust. Please consult with a qualified immigration attorney.

Green Card sponsorship for my wife's parents

You cannot sponsor her parents not can she. Only a US citizen can sponsor their parents.

What can I do I lost my I-94. Can I fill out the G -325A form best to my knowledge?

The problem is your I-94 is what proves your legal entry. That is much more important than filing out a form.

If the married is legitimate in Egypt it will be legitimate in the US unless it is bigamous or has some other legal issue.