Question – Hi I have sent all the documents with I- A

Hi,

I have sent all the documents with I-515A since I didn’t bring I-20 with me.
How long does it usually take to know my admit date to stay in USA has extended?
Is there any ways to check if it is okay now?

Question – Short background I ‘m a visiting scholar on J visa

Short background:
I’m a visiting scholar on J1 visa which is expiring soon in late February.
I’ve already applied for a waiver of 212e two-year home residency rule, and I’m going to apply for a marriage-based Green card as soon as I get the waiver of 212e.
My question is:
Can I continue working as a visiting scholar (no salary from sponsor university) while my I-485 is pending (before I receive the EAD)? What can I do in the USA while my I-485 is pending?
Thanks so much for your time!