Successor In Interest company name change amendment

my date is current in eb2, but i-140 needs company name change amendment in SII (big multinational). We are concurrently filing 485 + 140 name change amendment SII
How long does it take for such amendment?

You should be able to file i140 in premium.

so my company says we need to file it in regular first then we get the receipt notice and then we can upgrade to premium - they said something about PERM - that USCIS needs to find original PERM or something - so they suggested this route - i could not understand how upgrading to premium after receipt notice would help - kindly comment