At that point you have an airship making side-quests at more easier to do since it helps that you can see the requests for every town on the world map.
Though it may not be a bad idea to at least reach the lowest level in the final dungeon, which is right before the final boss, before doing some side-quests since it'll unlocks skits all over the world including in dungeons that you may need to revisit.
Of course you can always see them after beating the game.
That said, do you know anything about the post-game stuff? I'm not quite sure if you've been going through this whole game blind.
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SuperNiceDog smelled us all later.