I ended up pulling it off around 8:45pm and resting for an hour in a cooler. It was only at 190F when I pulled it, and it was falling apart. Will be reheating some for dinner shortly, but what I snacked on last night was delicious. I probably should've been checking for done at 180, but assumed it wasn't close at that point.
Peter: the Meater remaining cook time can often be a moving target - especially if you're dealing with something like a butt that will go through a stall. This was probably my least accurate experience with it though. Interestingly, you can manually set up a cook, which I usually do. But with this cook, I just chose 'Pork Butt' and the app set a target of 203F. There's no accounting for the size of the roast, so I'm not sure how it comes up with the cook time. All it has to go on is the internal and ambient temps.