It has spoilers for everything up through Buu, but I don't know that it would ruin anything for you. Spoilers, the good guys tend to win.
Dragon Ball
Community about Dragon Ball
Buddy, you're gonna have to put that shit behind a spoiler tag
/s
Link contains mild spoilers for the conclusion of the Buu Saga in Z, but pretty much what the other poster said.
https://screenrant.com/dragon-ball-daimas-timeline-placement-confirmed/
As a note, GT is no longer considered "canon", so barring something strange you shouldn't have to worry about other shows spoiling anything for it. From what little I've heard about Daima, it kind of seems like an attempt to do GT but good.
Honestly I would just disregard GT entirely now that we have Daima and Super. With Super releasing first it won't have any spoilers for Daima, so I would think you (OP) could watch it while waiting on new episodes to release
Personally I would watch it all in order. Daima will still be there, and even better, will have more episodes released