The August 2019 blockout calendar is up. Deluxe is allowed back into DL on 8/19/19 and So Cal/So Cal Select are back 8/26/19. (For DCA, Deluxe isn't blocked for Aug. and the So Cal APs are back on 8/19.) I fear the OP's proposed dates will be very crowded. The best day in DL may actually be the Friday departure day since both So Cal APs are blocked that day.
For the OP: since you said your dates were flexible, would it be possible to do this trip before Aug. 19th? The parks would still be crowded because of SWGE fans, but having the lower 3 APs blocked should really make a difference.
And D23 Expo will be 8/23-25/2019, so you'll have hardcore Disney fans doing the pre/post Expo parks visit for SWGE, too. Last Expo they got to see the preview of the model for GE; now they'll want to see the real thing.