https://www.gamespot.com/articles/fortnite-week-10-challenges-leaked-skydive-through/1100-6458424/

As has become the norm before the release of each set of weekly challenges in Fortnite: Battle Royale, the upcoming objectives have been leaked. We now have at least a sense for what the next challenges will ask you to do for Week 10--the final leg of Season 3--whether you're playing on PS4, Xbox One, PC, or mobile.

Weekly challenges, despite the name, are typically available for more than a week, although this is the final week of Season 3. Anyone who purchases the Battle Pass has the entirety of Season 3 to complete them. You can see all the Fortnite skins and rewards up for grabs with this Battle Pass to get an idea of what awaits if you dive in.