So if I preordered Borderlands 3 Super Deluxe do I get to keep the DLC packs that come with or are they limited time only?

I want to know cause it says they’re part of the season pass and I’m kinda foggy as to how those things work still. Just want to know if I’ll be able to take my time playing them cause they’ll be there whenever I want to or if they go away after awhile meaning I’d need to play them before that happens.