https://www.gamespot.com/articles/far-cry-5-pre-load-details-announced-before-releas/1100-6457650/

Far Cry 5 releases early next week for PC, PS4, and Xbox One, but eager players are able to get an early jump on downloading the game. Developer Ubisoft has now released the pre-load dates and times for all systems.

If you're playing on Xbox One, you'll be able to pre-load first as the game is now available for download (but not to play, obviously). PC players on both Uplay and Steam can also now do so as of March 23. And PlayStation 4 players can finally do so, though they had to wait the longest; the game wasn't available for pre-load until March 25.