I don't see this. A symphony: that can be present to us as a whole. A drama. A novel. The ways of remembering and anticipating presented to us in novels, from Flaubert to Toni Morrison. I suppose I disagree with the distinction you make in the op:
Yes I see this and don't disagree, however we can distinguish the brief moment of passing time, it's a reality and it is also clear that the moment we experienced a couple of seconds ago has past, it ceases to pass and is frozen as a historical record, perhaps facilitated by our memories.
I collect antiques, these antiques are present with me know in that moment, they also bear the marks of a checkered past, which they bring with them. It is by analogy like the way the light from a lighthouse swings around lighting the horizon in a great arc. This moment containing all the universe we experience is contained in that beam of light, of illumination. But surely our experience of this beam of light, of nowness, is a restricted experience, one dictated by the material universe that we find ourselves in. Like a two dimensional being not being able to experience the three dimensional reality of a piece of paper but confined to that two dimensional surface.
There might well be other beams of light (now) out there, indeed many, inhabiting the same
space, external to our spacetime. They might be as pages in a book in another dimension in an eternity of time, moments.
Biology is history, it seems rich enough to me to be the foundation of 'fundamental parts of our being', although I don't mean we can explain culture from biology. From biological beginnings we can imagine time as Proust or Hawking or Shostakovich imagines time: once we do this imagining, it's available to us at any given, ahm, moment, isn't it?
Yes, I don't disagree (this is though an explorative exercise). What you describe here is what I suggested, a full or pregnant moment, nowness, generated by our bodies, our brain, our mind, a simulation. It implies a minutely brief moment of time passing with scientific precision on the atomic scale, on the nano scale.