By the time the NCAA tells you they are investigating, it means they can pretty much prove whatever it is they say they are investigating, and now they are looking to see what else is there. SOP. And the NCAA delights in taking their time, it's part of the punishment because they know that it will hurt recruiting.
IF there's absolutely nothing more than Tunsil, you will probably hear something from the NCAA around the end of the year or right before NSD. But the odds are there's more than just Tunsil and if that's the case, this could easily drag out for at least another year.