Heat a large nonstick skillet over medium-high heat. Coat pan with cooking spray. Add pork to pan; sprinkle with 3/4 teaspoon kosher salt and 3/4 teaspoon freshly ground black pepper. Sauté for 8 minutes or until lightly browned. Add salsa and 1/4 cup water to pan; bring to a boil, reduce heat, and simmer 5 minutes or until slightly thickened. Serve pork mixture over rice; top with sour cream and avocado.