Thanks for the suggestion. While this can accomplished via PnP Powershell today, we understand the desire to have a way to do it in the UX. We’ll add it to our backlog.
We’re currently working on this feature now. You’ll be able to specify when your modern page actually gets published (date/time).
Thank you for everyone who has been providing feedback on this thread. There is a variety of work happening to make it easier for people to save to/from OneDrive and SharePoint. There are no specifics and ETA’s to share at this point.