This info is for
Disneyland, not WDW but I logged in yesterday at 9:15am PST yesterday and the estimated wait was 3+ hours. A little over 2 hrs, 15 mins later I was on a video call with a wonderful CM names Andi. She was able to help me get the
DAS all set up and even made all the prebooked return times without having to pass me on to a different CM. Not sure if it is the same at WDW, but not all attractions could be booked in advance, there were some that were not on her list such as Mickey&Minnie's Runaway Railroad and Radiator Springs Racers.