https://www.pcgamer.com/heres-when-fortnites-massive-season-5-patch-hits/

Fortnite Season 5 is under 24 hours away, which means that big crack in the sky will likely shatter and kitsune masks and viking axes will come pouring out. In a post on the Fortnite Battle Royale subreddit, Epic outlined exactly when you'll need to first download those axes and masks to your PC in the form of a massive patch.

Downtime begins at 4 am ET (1 am PT, 8 am GMT), shortly after which the patch will be distributed. Epic will twist some knobs and press some buttons and Season 5 will begin in the minutes or hours that follow. There's no specific time set for when the servers will be live again, so don't count on staying up all night just to—oh who am I kidding? I'll be up all night too, but let's temper our patience together, yeah?