Geeking out here a little....
I've been on a kick reading Star Wars books. Just choosing whatever my library has available. I just started Thrawn: Alliances. They books main setting is Batuu - Black Spire Outpost. This book was written in 2018 so definitely GE was in development. I'm dying to see how the book's descriptions and the land compare.
I hadn't thought about the fact is someone overseeing the Canon between movies and books and making sure it all jives. I guess most of the books I've read are older from the dark days (non-canon).