Now it is official that Asus has announced that it started rolling out Android 8.0 Oreo for the Asus zenfone 4.
The entire Asus zenfone 4 series which has
zenfone 4 selfie, zenfone 4 selfie Pro, zenfone 4 Pro and days memory variants will receive Oreo update.
The Android 8.0 oreo update would take around a week to reach all the zenfone 4 units worldwide. However, by default, the update will be notified on notification bar or you can check it by going system update settings.