If it were possible for a human being to be simultaneously present at both New York and London, then the distance between these two cities would be zero for that human being. But, for all the other human beings, this distance would remain the same as before.
If it were possible for someone to be simultaneously present at every point of the universe, then the distance from one end of the universe to its other end would be zero for that being, because this being would be simultaneously present at both ends. Similarly, the time taken to travel from one end of the universe to its other end would also be zero for that being.
Here, we can say that the properties of the light show as if someone is simultaneously present at every point of the universe. This requires some detailed explanation.
For the light itself, this universe is zero millimeters long. Both the travel time and the travel distance become zero for light. Now, if we suppose that someone is simultaneously present at every point of the universe, then the universe will also be zero millimeters long for that being, because it will be simultaneously present at both ends of the universe. Both the travel time and the travel distance will also become zero for that being, because it will be simultaneously present at every point of the universe. That is the reason why it can be said that the properties of light show as if someone is simultaneously present at every point of the universe.
Experiments on quantum entanglement also show the same thing. If we arbitrarily choose any two points from the vast space of the universe, then the experiments on quantum entanglement will always show that the distance between these two points is zero, because the connection between two entangled particles located at these two points will always take place simultaneously. Here also, we can use the same analogy. If someone is simultaneously present at every point of the universe, then for it also the distance between any two points arbitrarily chosen will be zero. So, both the properties of light and the experimental results of entanglement show as if someone is simultaneously present at every point of the universe, because in the second case also we will be getting the same properties as those that we get in the first case of light and entangled particles.
However, physicists may not accept our suggestion that as if someone is simultaneously present at every point of the universe. So, here is one more suggestion.
The universe consists of only one single basic particle P and this P is simultaneously present at every point of the universe. From this picture of the universe, we can now recover all those properties of light and the properties of the entangled particles. And we will find that this description of the universe makes quite a good sense.