When is the correct time to file for citizenship?

Assuming you are a US citizen and you live together, he can file 90 days before August 24, 2019.

Is it possible that my spouse can apply for GC(eb2) and she can port my PD based on my approved non-revoked I-140 petition?

Your wife cannot use your PD. Doesn't your current immigration attorney know this?

K3 and I-130 Enquiry

There is no advantage to the K-3. It is better in the long run to just process the I-130. And as I believe has been pointed out before, you wife...

If yours is denied hers will be also. If for some reason you are worried it yours, just file yours first and get a decision. If approved you can...

Filing immigration form I-130 pro se

There is much more to the process than the I-130 so using a board certified attorney is best but certainly not required.

Spouse petition

If the marriage license is valid in Mexico it will be valid if the US. But you will need much more documentation to prove up your relationship. It...

I am filing visitor visa extn for my mother in law , do i need to file for i 134 also

You can include that but much more important is a specific itinerary of what she will, where she will go and with whom.

F1 working off campus without working permission

If the Immigration Service gods out, our a school official finds out, you will lose your status and be forced to leave. Your child does not...

I-751 Form can i use the letter approval to travel outside the states if the old green card will expire?

The receipt extends your status for one year assuming you are still married.

If I want to renew my green card, how long does it take to receive it?

You should renew the card as soon as you can since it takes CIS several months sometimes to issue the new card. You do not need an attorney. Just...