According to the USDA, the internal temperature with an instant-read thermometer should read between 150- and 160 degrees F. The thermometer should be inserted into the center of the stuffing. I remove mine from the instant pot right away and then check it. It most often reads 150 degrees F or above. By the time I broil them to melt the cheese, they are close to 160 degrees F.  If yours are not that hot, cover them with foil and let them rest for 10 minutes or let them sit in the oven as it cools.