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So, we finally saw the fates in episode five, but they changed it to such a bigger meaning! In the book, the fates are shown when Percy leaves Yancy, because that’s supposedly when the fate is set in motion and he is brought into the Greek world at the right time BUT in the series the fate is decided much later:
All series Percy has been talking down on his dad, and been angry, thinking Poseidon doesn’t care, BUT when he is saved by his dad despite this, he changes, he begins to see the quest as a way to help his DAD, not just a god that fathered him. And I think this also meant Percy believes the gods CAN care and change. And so the fates appear because it is this mind shift that makes Percy never side with Luke in the finale and set the ending in motion. Percy wants to change the god’s mind, Luke wants to destroy them completely.