The preliminary August schedule to be loaded over the weekend appears to be viewable through the online routemap
https://dl.fltmaps.com/en
The number of flights is up significantly over June and July.
Looking at DTW departures per day:
June - 130
July - 198
August - 288
Peak summer 2019 was 461 flights.
So a lot of frequency/connectivity is coming back. I didn't look at the other hubs, but if DTW is effectively doubling the number of flights between June and August, I'd imagine similar at MSP & SLC if not more in ATL.