You will be get it maybe in next quarter. If you like please accept it's as a solution it's help to other users also, click on 3dots in my reply section and click on accept solution. You're welcome to here.
As per your query, we would like to inform you that as for now there is no official information available about UI 8.5 update for S8+ series. Please stay active on the Samsung Members application, as you will be notified when it becomes available for your device.
