For example, you can visit many commercial signals (such as this one) and see:
Paid signal: some information is available for Subscribers only. Subscribe to get full access.
Under the table of open trades. The table hides times (only dates are shown) and prices. I suppose, that signal provider have an option in settings to enable this limitation.
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.
Please tell me how to setup delay 30min.
You can hide you signal and nobody can't see it. Check this option in the signals edit page.