Timeline Jumping…?

I’m sure that many people have heard about the idea of timeline jumping, shifting timelines, or even being in the “wrong” timeline. With the popularization of quantum physics infiltrating our mainstream culture (Marvel movies like Dr. Strange, The Avengers, Spiderman, and others like Everything Everywhere All At Once), our minds have been largely opened to this as a possible (although fantastical) phenomenon. Aside from the comic book and whimsical, wacky nature of these popular films, could it only be limited to fiction? Or could it be a real construct for us to work with?