The installation of the concrete pier is spot on. You want the concrete to be even with the asphalt if at all possible.
If it is below the surface you risk not being able to get the rim height to a regulation ten feet. You can pour concrete before or after the asphalt is laid. If you do it after box out an area the size of the concrete pier. If you do it before, make sure to build the pier up a few inches to account for the thickness of the asphalt that will be laid down.