Place the turkey pieces in a large pot over medium heat and cook until lightly browned on all sides.
Add the onion, carrots, and celery to the pot and cook for 5 minutes until the vegetables begin to soften.
Stir in the wild rice and chicken broth, then bring the mixture to a boil.
Reduce the heat to low, cover the pot, and simmer for 45 minutes until the rice is tender.
Stir in the chopped sage, salt, and pepper.
Remove the pot from the heat and slowly stir in the heavy cream until the stew is smooth.