When to add the meatballs?

You're making veggie potato noodle soup and need to know when to add your partially cooked, frozen meatballs. The recipe starts by heating olive oil in a pot and sautéing onions and celery until softened and slightly caramelized. Carrots are then added for a few minutes before pouring in vegetable broth and Italian seasoning. Bring to a boil, then simmer for twenty minutes with the lid on. Next, the recipe calls for diced potatoes to be added and cooked for ten minutes. You should add your meatballs at this step. After the potatoes have simmered for ten minutes, add the meatballs, allowing them to cook until they reach an internal temperature of 165°F. Add the noodles and cook until they are done. Finally, stir in peas, green onion, and parsley for a few minutes. Season with salt to taste, and your soup is ready. Adding the meatballs with the potatoes gives them enough time to fully cook.