Creamy Corn Chowder

1 1/2 lb stewing beef, cut into chunks.  Sirloin or round is good for this.
1 large onion, chopped
4 stalks celery, chopped
1 medium red bell pepper, seeded and chopped
4 large red potatoes, peeled, diced
5 ears of corn, kernels cut off (should be 4+ c. of kernels)
1 teaspoon dried thyme
2 tbsp sugar
1 tsp Salt
1 tsp black pepper
1/2 tsp cumin
6 cups chicken broth
1/3 cup all-purpose flour
2 cup half-and-half
1/2 c. sour cream