Elusive intrigue of time travel may have blinded us from the answer to the question in plain sight.
The 3D universe is infinite edges contained within the ever constant acceleration of Time. Time is the ultimate boundary. Not even God will break its boundary. Time moves at a constant never-changing rate, neither changing in direction nor changing in acceleration.
Ever Constant Acceleration of Time
All heaven and earth; that is, all spiritual and physical universes, each with its own infinite-ness, are yet contained within the ever constant acceleration of Time, like a tunnel with infinite walls.
All movement is necessarily contained within Time. Without Time there can be no movement; neither of physical objects, nor of energy, nor of thought, nor even of spirit. If Time could stop, all would freeze in immediate stasis, the definition of ultimate death, even for God. Time cannot stop because God cannot stop.
There has never been a time without Time. Had Time ever not existed, it would not exist now because change requires motion, and Time is required for a change from a state of “no Time” to a state of “Time”.
Einstein said Time can bend. I don’t know about that, but maybe Time has come for The Grand Unified Theory to be discovered. Make Time the constant, and I predict that the equation can be balanced.
But who am I? I’m no physicist; I’m just an apologist.