For now, I see Harper's relationship to still be "close, trusted friend" for now, and I don't expect any romance between her and MC for at least another few in-game days after the upcoming match, maybe even another in-game week after that. Right now, she's his coach, and mother of one of his girlfriends (if you chose that path).
But next up, is a more serious chat with Bailey+Rainn to clear up any misunderstandings or loose ends in their friendship (and possible relationship, either just the two alone, or more likely, together with MC. Fingers crossed that Rainn might actually ask to become a girlfriend of both MC and Bailey (who knows - but with the story progress so far, it's a possibility). I hope this talk will occur either on the morning before the big first game, or right after the game (later in the day).
And, as mentioned, MC and Kimmy need another one-on-one talk, after what happened in the infirmary.
Other than those things, I'm looking forward to see how the big game turns out in the next update. For some reason, I expect some sort of deus-ex-machina event that requires MC to step in after all (for a miraculous save), even though he's technically benched for this game. Then again, who knows how Braindrop plans to let this play out? I'm excited either way.