If you use OneView mode and set its UpdateCPlane and ViewLabel options to Yes, you will see the name of current construction plane, including named construction planes, in top-right corner of the viewport. Unfortunately, if you change the current construction plane with the NamedCPlane command, OneView ignores NamedCPlane, so it generally displays wrong name of current construction plane.
There is also a problem with the NamedCPlane command. Its panel generally provides no clue what is the construction plane. If you double-click name of a construction plane, the plane becomes current and its name is highlited. Otherwise, you have no clue what is the construction plane.