That’s actually a great question! In America, there are different ways. Some families cook the stuffing separately and serve the stuffing separately. Some cook the stuffing at the same time when it’s inside the turkey. If you go this route, just make sure that the meat is precooked and also keep in mind that it may slow down the cook process for the turkey. Once everything is done cooking, people eat it together. Some people take the stuffing out. However, typically, they eat the stuffing and turkey together if it was cooked together.
It’s really just a matter of preference. My family will do two types of stuffing. The non meat stuffing cooks inside the turkey. And then, we have a separate stuffing with meat that is cooked separately. Hope this helps!