J7 Prime has already completed its 2 major OS updates ( android 7 & 8 ) so it won't get OS updates anymore.
Samsung provides 2 major OS updates to their midrange devices according to their update policy.
And talking about security patch updates Samsung promised security patch updates for 3 years for their old devices and J7 Prime is now more than 3 years old so the chances of getting more updates is nearly equal to zero.
