Add chicken, potatoes, carrots, celery, onion, salt, pepper, and thyme to a 6-quart slow cooker.
Stir in the chicken broth and condensed cream of chicken soup until well combined.
Cover and cook on Low for 6 hours or High for 3 hours until chicken is cooked through and vegetables are tender.
Thirty minutes before serving, stir in the frozen peas and heavy cream; replace cover.
Preheat oven and bake biscuits according to the package instructions.
Split baked biscuits in half and place them in bowls.
Ladle the chicken mixture over the biscuits and serve immediately.