that's unnecessary. no one can watch signals for 24*5
A delay on posting the trades opened on the publication page (not the signal or trade) would probably be a good idea. It would be impossible to continuously refresh the page on a given commercial signal all the time, but there are browser plugins that allow a user to be notified in case of changes in a web page.
For scalping signals, this is not much of a problem since it may be already too late to copy the trades manually. But for signals that trade long-term, it might be.