Assassin's Creed: Origins will receive a patch next week (May 24-26), which will allow the game to run at 60FPS on this generation console.
According to the PlayStationSize, the 1.60 update of Assassin's Creed: Origins will include the following content:
Add a series of menus
Open higher frame count when running on PS5 host
The patch was originally released by Ubisoft last December when Ubisoft made it clear that "they are considering adding 60FPS support to Assassin's Creed: Origins, so stay tuned."
Last August, Ubisoft added 60FPS support (backward compatible with PS5 and Xbox Series X|S) to the 2018 Assassin's Creed Odyssey.