As long as it’s not a major holiday, like Christmas, you can get pretty much any ride in MK same day…repeatedly. We regularly get the mountains, Buzz, HM, PP, you name it. Even 7DMT isn’t impossible at all. In fact, we almost never do standby for anything at MK that has a FP+ line…the only exception would be something like Philharmagic which has no need for FP+ most times. With some checking and modifying, you can get SM for 10 minutes in advance, we do that a lot (it’s our kids’ favorite ride), same with Splash. Even Xmas has open FP+.
TP would have no idea what’s really left, there’s no possible way they can, as it changes literally second by second. Don’t bother with that.