Ah seven days after the release date, check the http://www.avast.com/eng/avast-4-home_pro-revision-history.html page for release dates.
Though if you are already experiencing problems with the VPS not updating the same issues would be present for the program update, so I wouldn’t wait. Not to mention trying the manual update procedure will also confirm if the update functionality works, if it does then there is likely to be a problem with the auto update function.