https://www.gamespot.com/articles/fortnite-servers-down-for-maintenance-on-ps4-xbox-/1100-6456530/

Following a delay, Epic Games is prepared to release the new update for Fortnite. However, that process will require a period of server downtime, which begins at 10 AM PT / 1 PM ET / 6 PM GMT on PC, PS4, and Xbox One. There's no time table for how soon it will return, but we'll keep this story updated with any developments.