That doesn't really make sense. Digitec is not gonna provide all nokia 8 devices with updates, that has to be nokia. Nokia 8 is currently only in the beta with oreo, might google a bit or wait for the providing updates. Don't forget, it even changes in diffrent regions eu,us,as.
No, Nokia is in beta with Android 8.1. Android 8 (Oreo), is not in beta anymore (it was in before December tho). They said, the schedules are different, but they also said, that to know when I will receive the update, I need to contact place I bought the phone from, or mobile operator.