Is this a good 40 yard dash time for a freshman?
Not bad for a freshman. You will need to improve it sime by you senior year, but don’t buy into the 40 hype. The numbers you see in college are with special shoes, and after years of conditioning drills. At QB, your 40 is not so important, it is your brain, and your arm, in that order. By college you really need to be 6 foot though to have much chance of taking it to the next level. The best person to evaulate is your coach, as that is his job, and he can see all the variables that we here, cannot.
