Well, even if you know the time stamp, it would not help you to determine, when the next days' update will follow, because the update will be put on the list after 24 hours. Then it will take some time until your update is on the list and it will be run then. And the list varies from day to day I suppose.
That's the reason why you don't get the updates at the same time every day.
I don't know if there is much work to program it, but I personally don't see any advantage from it.