Okay, you dropped him into ST continuity right where I suspected you might from the title. From the comments to McCoy, I take it that this is more or less immediately after the evnts of "City on the Edge of Forever". It should be rather interesting to see Harry learning and growing in the far future before he returns to his present. Meanwhile, he'll need to find out just how much is known about the magical world in this time (could probably make for some interesting data serches on his part). All in all, it's developign quite nicely.
Author's response
Your pretty much dead on with how I have this planned out. All I can really say at this point, without giving a lot of things away, is that if you can imagine what might going on with the command cadets just before Saavik goes into the bridge simulator to take the Kobiashi Maru test, That's where this whole this is going to end. About 5 minutes before the start of Star Trek II.