Somewhere I heard that for every variable, every choice we make, there's another universe created in which we make a different choice, and that eventually those other universes will crowd out our universe, shrinking it into non-existance.

Whether those universes contain timelines ahead of our own...don't know.

But I don't think in our average everyday lives, that tomorrow already exists. That would mean that every choice we make, everything we do, is already pre-programmed, with no way of altering the programming. Kinda like the Matrix.

Adrian