SEDE currently states it was updated 11 minutes ago:
However this does not appear to be the case, as this query:
select max(creationdate) [last action], datediff(day, max(creationdate), getdate()) [days ago] from posthistory
When run on SO, currently yields:
last action days ago ------------------- -------- 2017-07-02 05:18:54 8
Which suggests that no data exists for the past 7 days.
I had originally just assumed this was an issue on all sites but the comment below points out (and I've confirmed) that it's not. So far I haven't found any other sites that exhibit this behavior besides SO (including MSO, which is up-to-date).