Mortgage Interest Rate

We are closing on a house on the 21st and have not locked in an interest rate because we are hoping for it to drop. It was 6.5% on July 2 and on July 3 it went up to 6.625%. Any chance of it coming back down after this holiday weekend and before the 14th. Should I purchase the Float Fee of $500. NEED ADVICE PLEASE 🙏🏽