The Closing Disclosure is the final version of the Loan Estimate, showing your exact loan terms, monthly payment, and all closing costs. By law you must receive it at least 3 business days before you close, giving you time to review.
Compare your CD line by line against your most recent Loan Estimate. Lender fees can't go up at all between LE and CD. Most third-party fees you shopped for can go up to 10%. Prepaids and government recording fees can change without limit.
If anything looks wrong — wrong loan amount, wrong rate, missing seller credit — speak up before closing. The 3-day rule exists specifically to give you time to fix problems before you sign.