With the time remaining, you are gonna be rushed no matter what you do.
It should have plenty of smoke flavor by now, so I would foil it with some Jus or beef broth and into the oven at 325 or more.
Monitor temps, probe for doneness, and try to get some time in a cooler or warm oven.
"Flirtin' with Disaster" BBQ Team (RETIRED)
FBA and KCBS Cook and Judge.
Former owner of a WSM, a Smokey Joe, a Charbroil Commercial gasser (junk), the legendary "StudeDera" and Sherman.
Now cooking with a Fast Eddy PG500
Proud Pellet guy cooking on real wood.