The idiom last hurrah refers to a final act, achievement or effort, which is what the person is mentioning in the context before they bow out gracefully.
Consider the statement "I'm about to be on helen's show,I say, and then I explain how it's my final opportunity, and then I 'll bow out gracefully.". Based on this "I'm about to be on helen's show,I say, and then I explain how it's my last hurrah, and then I 'll bow out gracefully." a true statement? Yes, no, or I don't know?