See vertex count of subdivided object before applying modifier There are answers about the info bar (by default at the bottom right of Blender 2.8) but it seems it only shows current stats on the selected object (when in edit mode) and not what the stats will be after a modifier like Subdivision is applied.
You just have to be in object mode to have the vertex count of the object including its modifiers.

To have the polycount of a selected object, for now, there is no dedicated statistics for that. A workaround would be to temporary isolate your object in a layer (or collection in 2.80) and hide the others. Then you will have the right stats.