from what i have read in the part i think this is currently expected. From what i know the ownCloud people are always delaying the release of an update via the updater app by some days / weeks.
Iām not fully sure about the reasons but from what i can remember i think it has something to do with mainly users without shell access are using the updater app:
If each update would be immediately published but has a major but not yet identified issue during the update the users without shell access would be left back with a non-working installation.