According to a report from the latest Wrestling Observer Newsletter, All Elite Wrestling will officially be airing live in the West Coast from 5 to 7 PM with NXT airing on a delay add 8 to 10 PM local time.
This means that both brands will be running unopposed in the West Coast. This gives NXT a slight advantage in the ratings as it will be airing prime time in both markets.
Back in the days of WCW, Nitro would be replayed in the prime time slot on the West Coast after having aired live hours beforehand. Currently, there are no plans to do this with AEW.