If by “omniscience” you mean “knowing the truth value of everything”, then of course any omniscient being will know the future of everything. This applies even in the case that you assume that there is one world for every possibility.

What does it mean to be an omniscient?

having infinite awareness, understanding

Definition of omniscient
1 : having infinite awareness, understanding, and insight an omniscient author the narrator seems an omniscient person who tells us about the characters and their relations— Ira Konigsberg. 2 : possessed of universal or complete knowledge the omniscient God.

What does omniscient mean in philosophy?

Omniscience is an attribute having to do with knowledge; it is the attribute of “having knowledge of everything.” Many philosophers consider omniscience to be an attribute possessed only by a divine being, such as the God of Western monotheism.

How can one be omniscient?

Omniscient meaning all knowing, implies there is nothing that can be known that is not known. But other than the assumption, if there is information or knowledge one does not know, you do not know that you do not know, because you do not know.

Is omniscience logically possible?

But the logic of our language does not show how such a statement, even if it happened to be untrue, could ever be self-contradictory. That implies knowing what is by definition unknown: the non- existence of unknown facts. Hence omniscience is impossible.

Why is omniscience impossible?

The beliefs of an omniscient being, we have said, would correspond precisely to a set of all and only true propositions. Because there can be no set of all and only true propositions, there cannot be what an omniscient being would have to know, and thus there can be no omniscient being.