About PCC ,if you have got TLU ,they will not gonna ask you for PCC now ,if they wanted would have asked you before updating Third Line .
But if you jut have received Medicals and yet to receive Third Line Update ,they might ask ,totally depends on Visa Officer .
My experience as below :
Applied :4th December from India
Came to Malaysia to work on 16TH December
Got Medical Request on 24th May also RPRF and Original PCC from India on 24th May .I replied back to the mail as well as raised CSE on 27th May mentioning that I left my job in India on 2nd December and came to Malaysia and send them required documents like (relieving previous company,offer new company etc). I got a reply back from my Visa Officer mentioning Malaysia PCC is also required .
On top of that I replied back with 2 mails to him mentioning that I am just in Malaysia for 5 months and Malaysia Govt provide PCC only to people who stayed for 1 year with screenshots from Malaysian Indian Embassy and Malaysian Ministry of affairs website .
Next day I got a reply back quoting ,"Ok.have chked ,Malaysia PC not required" from the Visa officer.
But as mentioned all depends on Visa officer and yours is US so they don't even have any 1 year rule I guess ,If you have time you can try getting it.
Wish you Speedy Process