Some sources say that the average typing speed worldwide is 40 wpm (word per minute). And there's this answer from Quora saying that the respectable typing speed for programmers should be 50 wpm. If you are a fast typist, probably you could capitalize on your typing skill.
For a programmer the typing speed should be maximum based on his skills in typing. The average typing speed for most is 45 WPM, this same applies for a programmer. However, this is just an average. If you want to improve, then you can aim for 60 or even 80 WPM.