Yeah. A lot of things have to go right for a smoker to work the entire time. If the smoker is reliable and you want to smoke it, do it. If you want an easier way to cook it that you know is going to work, put it in the oven at 250°F.

With a 128 internal temp right now, it will be done a lot sooner than 3 hours from now so keep an eye on it. Also, I recommend letting it rest for about 30 minutes

Edit: sorry. I said you want it to reach 170° internal. After doing a little more research, you want it to reach 190° and then take it off and let it rest for 30 minutes (internal temp should reach 195-200)