Although we do not regard time as fundamental, it is instead emergent, along with space, from the phase progression of the waves of bosons.
In the definition of a boson, we declare a fundamental equivalence between phase progresion and time progression, and for direct propagation, displacement.
Dimensional space, however, is the result of several interactions, and is only derived from, rather than equivalent to, solutions of phase.
All our bosons, without exception, traverse at the same speed (light speed), including those with mass-energy. This means that all collapse events occur on the time cone of the source event. Slower (sub-relativistic) velocities are obtained by taking indirect paths, traversing many fermion events, which is more likely to happen with bosons having higher mass-energy. We can derive Snell's Law and other medium-dependent or scattering-dependent effects using these principles.
However, until collapsed, a boson exists at all points on its sphere, and a collapse of one of the waves then enables the other wave of that boson to collapse. It should be remembered that this still does not transmit information around the sphere; it only increases the amplitude of wave collapse, by adding a further possible phase solution to the collapse condition.