You don’t need to be the US while applying for a green card. You can be living in, like, France, and apply for an EB1 green card with USCIS and then when it’s approved go to the US Embassy for a EB1 visa stamp and move to the US. This is what I meant.
In this case you don’t need a non immigrant visa because you don’t live in the US while it’s processing.
In this case you don’t need a non immigrant visa because you don’t live in the US while it’s processing.