If you look at the score (I screenshot a page, but the file is too big to upload), that section is playing with the entire wind section including horns, at ff. In other words, no one’s going to hear the harp!
So I wouldn’t stress. I suppose the most likely notes to be heard are the highest.
Yeah, I listened to several youtube videos and can’t hear a thing of the harp in that section, which is why I wonder if I should even bother breaking my hands trying to play that at the breakneck tempo. Those chords are way too big for my hands at that tempo lol.