The Triforce was split before TP. However, it was brought back together in WW, LttP, and AoL. It flies away - presumably back to the SR - in WW; so OoX most likely takes place after one of the other two. (Ganon is also dead after LttP and AoL, as is required for OoX.) It is likely a direct sequel as Link is free to enter the chamber holding the Triforce. It is also likely a prequel to LA, linked by a very similar boat/raft sprite and LA's backstory of Link returning from training after saving Hyrule.Hard to say. Nothing I've seen in the games hints at a place in the timeline really. But the presence of the triforce in Oos at least suggest Child timeline, because the triforce wasn't split in that, was it?