There's nothing to worry about 😂 J6 is gonna get the update for sure! May be, by the end of this month or most probably in the first week of July but the highest chance of getting the update is by this month end only. As per the schedule stated by Samsung.
I don't think we'll get this update by EOM, cause whenever they rollout update they also update the list in notification where one ui 2.0 with android 10 is mentioned. and for now I can see devices which should get one ui on may they are still in queue. not sure whether A6(MAY) did get this update or not.
maybe I'm wrong but this is a fact. I've been chasing this since 2yrs.