Go to his bank and show them the will and try to get his money. Good luck. They will tell you to come back with Letters Testamentary from Superior Court.
Until a court declares the will to be the last will and testament of our departed, it is as dead as they are. In other words, the Court is the only authority for declaring a will should be followed.
Consider other possibilities. What if there are other wills? Maybe the one your uncle left with you is not the last will. Perhaps there is a codicil. Anyone with an original will must surrender the document to the Court within 30 days of death so these things can be cleared up.
Probate is not a bad thing. Neither is a will. They just have to go together to mean anything.