Well, I’m certainly learning new terms here… “physical plane” ? I just can’t see how you separate so many things so easily. For example, one of the big issues in the early church was whether Jesus was man of God, or to what extent he was each. Half man half God? God on Tuesdays and Fridays, man on the others? No, the answer the church resolved on was that Jesus was both fully man and fully God, at all times. I can accept this, in fact to me no other answer seems appropriate, but I certainly can’t understand it. The physical world we live in, comes from and is part of the other that is often beyond our ability to comprehend. I have trouble with the view that it is a “plane”
As for the nature of time … Jesus mentions many times in the Bible that if you believe in him, you will have “eternal life” and “live forever”. These would mean nothing if time had an end. So I don’t think time will just stop, but if we get to Heaven, we will not be bound by time and see it for what it really is. The very nature of time will change. Perhaps this is what your priest meant when he said “stop”, for the role time plays in our being as we live on earth will stop. No, God is not bound by time, just as He is not bound by space. He always was, is, and forever will be.