Samsung has updated the Security Updates page on its website. While some 2016 models -including Galaxy J1 (2016), J3 (2016), A3 (2016) - have been removed altogether, what's surprising is the recently launched Galaxy A8+ (2018) is in the 'quarterly security updates' section.
This means the device won't get monthly updates. The Galaxy A8 (2018), on the other hand, sits in the 'monthly security updates' section. As for other changes, the Galaxy J2 (2018) and the Galaxy Tab Active 2 both have been added to the quarterly list.
Samsung themselves must be confused with their own product lines they do not know which to update or not.
Is there any Possible, J7 Prime,may also have an Update to Nougat?
Just because they have a phone on a monthly update list, does not mean you would get monthly updates. I have a note 8 and the last update I got was in December last year. Three months are gone and looks like they won't be giving one anytime soon.