This should typically work on 5.0:
On 5.0.2, in your footer template, find:
Sorry, but you need at least 25 posts and 5 hours online time to unlock hidden content.
Save, (ignore the error about you violating the copyright, old messages are stupid).
You should see the time as shown in the tiny preview.
I use generated at, because the guest cache by default is 10 min long, makes it more clear that the page might be cached in some cases.