If you are in a postion to close your escrow today or tomorrow, you must have signed your loan documents already? If so, the loan you have signed docements for has the final rate set.
It looks like you have a really good rate compared to the current market, depending on the points you were charged, if any, and other lender fees. You would need to compare these costs to rates you could get today at the same fees. There may be no significant difference.
I do think you have a winning rate regardless, and should feel good to go on your closing.
All the best,