Android Oreo was released by Google a few months ago and with all the new features that the Mountain View company decided to implement in it especially to make it more secure and in step with the times. In fact, however, its release occurred initially for smartphones "made in Google" as the Pixel and the Nexus while the other companies are still taken in porting Oreo in their custom interfaces.
Samsung is one of these because at the moment there are still many smartphones that have to receive the new Android 8.0 Oreo and that are somehow making the users feel impatient. XDA has decided to take stock of the situation of which devices will actually receive the new firmware from Google and which will be difficult to receive.
Here is the whole list of Samsung devices that could receive Android Oreo based on the assumptions of the community but also on what was discovered by the first firmware in Beta that have long reached smartphone with the Galaxy S8. In fact, this list, being unofficial and not confirmed by Samsung, may not be completely truthful and therefore not everyone could get the new firmware.

Smartphone with possible update to Android OREO
Samsung Galaxy A3 2017
Samsung Galaxy A5 2017
Samsung Galaxy A7 2017
Samsung Galaxy A8 2016 SM-A810
Samsung Galaxy A8 2018
Samsung Galaxy A8 + 2018
Samsung Galaxy J3 2017
Samsung Galaxy J5 2017
Samsung Galaxy J7 2017
Samsung Galaxy J7 +
Samsung Galaxy J7 Duos 2017
Samsung Galaxy J7 Max
Samsung Galaxy J7 Neo
Samsung Galaxy J7 Prime
Samsung Galaxy Note FE
Samsung Galaxy Note 8
Samsung Galaxy S7
Samsung Galaxy S7 Edge
Samsung Galaxy S8 Active
Samsung Galaxy S8
Samsung Galaxy S8 +
There are also PRO versions of smartphones that could be updated. On them, however, the certainty is lower than the other models even if in this case the similarities of hardware could make us think of the arrival also for Android Oreo. In this case we talk about:
Samsung Galaxy C7 Pro
Samsung Galaxy C9 Pro
Samsung Galaxy J5 Pro
Samsung Galaxy J7 Pro
Samsung Galaxy S7 Active
Tablet with possible update to Android OREO
Samsung Galaxy Tab A 8.0 SM-T355
Samsung Galaxy Tab A 8.0 SM-T380 / T385 2017
Samsung Galaxy Tab A 10.1 SM-T580
Samsung Galaxy Tab Active 2
Samsung Galaxy Tab E 8.0
Samsung Galaxy Tab S3 SM-T825
In this case for the tablet, Samsung, should be able to update all the latest models capable of supporting Android Oreo.