Steps in USCIS process for concurrent filing of I-140 and I-485 under EB1?

[KayCee]

Hi,

Appreciate any feedback that I can get on below questions:

Does USCIS accept I-140 and I-485 simultaneously?
Do they provide separate receipt numbers for I-140 and I-485?
Do they process I-140 and I-485 simultaneously?
What is a typical processing time for I-140 and I-485 under EB1 category (PD current)?

Thanks for your time.

KC