https://www.gamespot.com/articles/fortnite-maintenance-taking-place-tuesday-ahead-of/1100-6460671/

A new update is on the way soon for Fortnite: Battle Royale. Coinciding with the game's first anniversary, Epic is rolling out the v5.10 patch on all platforms--PS4, Xbox One, PC, Nintendo Switch, and iOS--tomorrow, July 24, which will kick off a special, limited-time birthday event and introduce other new content to the battle royale game.

As usual, the v5.10 update will be preceded by a period of server maintenance, during which time the game will temporarily be taken offline. Epic hasn't revealed how long the maintenance will last, but it is scheduled to begin early in the day at 1 AM PT / 4 AM ET / 9 AM BST.