I heard different scenarios shared in Facebook groups.
*some of them got interview waived for I-485
*most of them submitted the notice letter of the j1 waiver. So, the adjudicating officer knows they are waiting for the waiver and will ask for RFE
*some is very timely when they received their waiver
It is really a risk. But for those with j1 visa and about to expire they go that route to get EAD and work legally.