oh fuck looks like we have to give a little lecture here.
The atmosphere is not as thick as you reach up into 20 miles of orbit as it is here close to Earth. Your idea of terminal velocity only applies to a more traditional skydiving jump, where most people would likely to be falling and need to know that information, is around 120mph.
He will be much higher than that, with less air resistance falling for an extended period of time. If you really want to calculate it out, yes he can potentially reach the speed of sound.