On the 16th July 2019, Assassin’s Creed Odyssey’s season pass content came to an end with the release of the final episode in the Atlantis DLC saga. Spread out over the course of more than nine months (Odyssey launched on the 5th October, 2018), the season pass was clearly designed to keep players coming back.
Source: N4G PC Has Assassin's Creed Odyssey's Season Pass Been Worth It?