The official Pie update along with the OneUI will drop in March for this and the S8+, providing no nasty little bugs crop up between now and then.
To check the progress go into your Samsung folder on your phone and fire up the Samsung Members app to see the official notifications. (Sign up might be required)
To check the progress go into your Samsung folder on your phone and fire up the Samsung Members app to see the official notifications. (Sign up might be required)