It is a typical misconception to think questions like that - about "what time it is," or what's real beyond what you can see at any given moment - are answerable. I can tell you what the laws say: since it takes time for cause and effect to travel at the speed of light, if the universe is being simulated (bear with me, this is not a comment about simulation hypothesis), the minimal information stored in the simulation could be laid out along any surface in 4D spacetime that doesn't have any edges sloping steeper than the speed of light. I think that's a fair condition to impose on "metaphysical reality" without simulation as well. Anything more than that, including whether there is information being stored/existing (I think those two very different concepts have about the same handling in these discussions) in addition to this surface that's minimally necessary to compute/evolve other moments than the moment you're reading this, or the contours of that surface, can't ever be resolved by experiments or observations - because it's due to a really simple fact about PDEs that would be true no matter what PDEs you were using.