Does AOS processing begin after I-140 approval?

Hello,

My employer has filed I-140 and I-485 concurrently. Does I-485 processing begin only after I-140 has been approved? Will I get receipt number only after I-140 has been approved?

Thanks

You should get receipt for both i140 and i485 irrespective of when i140 is approved.

Can the process of I-485 adjudication start before I-140 is approved?