One of the posters on Bluray.com is a BBY employees who usually posts a list of Instore items on Sunday or Monday and just posted his list. It did include X-Files S11 as an in-store item
EDIT: Just checked the release day update and it appears most stores have 2-3 in stock available and for...
Often that shows up on the weekend prerelease. It's a 7 digit SKU so it's possible it will be in store, but I guess we'll have to wait until after 1-2am ET to see what changes