Everything happens all at once. Inching forward, at a steady rate of one second per second. When we tell a causal story, such as describing the action of a machine, we pick out one strand in that whole, prioritising it over all others, and generating an artificial cleft between foreground and background. But everything is part of everything, all flowing together. Heraclitus’ vision, I think. Among that we pick out agents and the inanimate, and bring into being shitty gods, minds, subjects.
This is not a moving slice through a 4-dimensional manifold, as Parmenides and Newton would have it. This has very many more dimensions, for it must accommodate your unfolding locus of experience and mine. The number of dimensions is not at issue, really. Professor Bohm seems to assure us of that. What matters more is how one treats the divide between subject and object. How we apply the carving knife, for the image we are carving is our self portrait. Like a mewling infant, we do not know what we look like, but we react anyway, sticking out our tongue at the world as it sticks its tongue out at us.