Of course you are not done. But if you don’t already have an introduction written, try writing your one as if you were. Just sit and bang out 2-5 pages. Write about the larger problem or issue (what do you know about it? include what you think you know too) and write your way to your purpose.
You are bound to see more clearly what you already know and what you need to find out. You’re also likely to sharpen your focus. Try it! Then share it with your committee.