We've had Fastpass+ support for the touring plans since April(?). Something like that. So you can see how it would affect any touring plan for any day. (There's still a lot of secondary unknowns, like how much Fastpass is going to affect Small World, for example, but we're working on it.)
For the book, we added the estimated Fastpass return times to each touring plan, and then rank the attractions by how much time you'd save in line by getting the Fastpass. Here's sample text from one of the plans:
Start time for Fastpass+: Peter Pan’s Flight 10:15 a.m.; Buzz Lightyear’s
Space Ranger Spin 3:50 p.m.; Jungle Cruise 5 p.m.; The Many Adventure of Winnie Pooh 7:35 p.m.;The Barnstormer and Dumbo the Flying Elephant 7:25 p.m.; Under the Sea 8:10 p.m. Prioritize Peter Pan’s Flight, The Many Adventures of Winnie the Pooh, and Under the Sea if needed.