It's too soon to book for 8/1 and later unless you have a WDW resort reservation and can follow the 180+10 booking.
180 days from 8/1 is not until Thurs., 2/1/18
You can only book ADRs for 8/1 NOW if your checkin date is 7/22 or before. on 7/23 you would be able to book for 8/2, etc.
Someone will correct me if I'm confused on that.