Tilapia Corn Chowder

Name: Tilapia Corn Chowder
Ingredients: 2 ounces bacon, (about 2 slices); 1 teaspoon canola oil; 1 stalk celery, diced; 1 leek, white part only, halved lengthwise, rinsed and thinly sliced; ½ teaspoon salt; ½ teaspoon freshly ground pepper; 4 cups reduced-sodium chicken broth; 8 ounces Yukon Gold potatoes, diced; 2 cups fresh corn kernels, (about 4 ears); 1 ½ pounds tilapia fillets, cut into bite-size pieces; 1 teaspoon finely chopped fresh thyme; 1 cup half-and-half; 2 teaspoons lemon juice; 2 tablespoons chopped fresh chives, (optional)