No need to wait. The thinset is just to fill voids and ensure the cbu is fully supported...the nails or screws hold it in place. Tile away.
Now, if it were the tiles on top of it, that's a different story, as there'd be no screws holding things in place!
did you also install the special alkalai resistant mesh tape on the joints like the instructions say? This is important, too. Looks like the stuff you'd use on drywall, but is specially made to not disintegrate in the mortar. You can do this as you lay the tile, and it makes it a little easier since you won't create 'speed bumps', which can occur if you do it in advance.