"You have done well" or "You have done right." Your culture might have an expression that a master (or someone in authority) would use to show that he approves of what his servant (or someone under him) has done.
The phrase "Enter into the joy" is an idiom. Also, the master is speaking about himself in the third person. Alternate translation: "Come and be happy with me" (See: [[rc://en/ta/man/jit/figs-idiom]] and [[rc://en/ta/man/jit/figs-123person]])