God Knows Everything About the Past, Present, and the Future

Presentists have no problem with the idea of praying for things in the future, even though the future isn't yet real on their view. In the same way, if god were inside of time, which he is not, and if only the present exist, he could still affect the present on the basis of prayer he foresees that someone will say in the future. Can you give us a concrete example of how that would work? Sure, god is omniscient. And that means he knows everything about the past and the present and the future. On the presentest view, it doesn't matter when a prayer is uttered and then gets fulfilled at a different time.