A list of Samsung devices has appeared on the web and all M smartphones are still on, as well as most of the devices released in 2018 and 2019.
According to the published list will not be updated - Galaxy S8, Galaxy S8 + and Galaxy Note 8+. The same goes for the Galaxy A8 +, A6s, A8s, A7 2018, A40s, J4 Core, J2 Core, J2 Pro and J7 Prime 2.
The list does not indicate exactly when the update will reach certain devices. But we can safely assume that Samsung's flagship phone Galaxy S10, S10 +, S10e, Galaxy Note10 and Note10 + will be the first devices to be updated to Android 10.