208*? I start checking about 190* for a butt I'm gonna pull, if I get resistance, I check again in 30 minutes, repeat. I stop when the probe slides in without resistance, let it cool down on the counter top (don't wrap or rest in cooler), pull it by hand, then eat.
This is just me: If you wrap it it will continue to cook. It's done if the skewer slides in -- it doesn't need to continue to cook.
In his book Low & Slow: Master the Art of Barbecue in 5 Easy Lessons, Wiviot says, "There are various general indicators of doneness, but the shoulder is only truly done when you observe all three of these signs in the meat:
1. EASY PIERCING Insert a meat fork into the shoulder. Does the fork glide easily into the meat?
2. PULLING AWAY Check the blade bone. Is the meat pulling away from the bone? Is the bone loose when you wiggle it with a pair of tongs?
3. RIGHT TEMPERATURE Poke an instant-read thermometer into a meaty (not fatty) section of the shoulder. Is the temperature 197°F to 200°F?
If you can say “yes” unequivocally to all three questions, the pork is done."