There is no evidence of the future....
There is plentiful evidence of Special and General Relativity that tell us that there can be no universally applicable moment in time, hence no present moment and no absolute past or future.
There is no evidence that the present is a physical reality. 'Now' is like 'here', as far as the evidence goes.
We now that at the Big Bang physical laws are not thought to be applicable.
Drivel. Humans not yet knowing the relevant laws does not imply that no laws are applicable. There are several hypotheses.
What does Popper tell us.
Is relevant to an omniscient god, in what way?
Physicists talk of unstable universes phase shifts etc.
There may be overarching physical laws
A God who is omniscient i.e. Knows everything that exists or has existed is responsible for physical laws of which there is evidence that they were not always applicable. That is true even if God had decided there should be a future.
Even if we ignore the evidence that there is no real present, if there is a god of the omnis, the future either depends on laws that it has established and fully understands, on its own interventions that violate said laws, or on some truly random element that it has decided not to know about.
In the last case, can an omni god decide to keep itself in the dark? Sounds like an omnipotent god relinquishing omniscience.
In the second case, does an omniscient god know its own mind and hence what it will do in some (predictable) future scenario? If not, how is it omniscient?