Provided the zone is set to single room zone, the HR92 will display the temperature measured at the T87RF - although it will be delayed by a few minutes so they won't always agree exactly when the temperature is changing. When you have a remote sensor the sensor built in to the HR92 is only used for open window detection.
Unfortunately the configuration page will not list remote temperature sensors like a T87RF - it will still just say radiator valve.
The only sure fire way I know of testing the binding is correct is putting the wall sensor in a hot or cold location for 5 minutes or so and making sure the reading on the controller changes appropriately!
It's usually just easier to rebind the temperature sensor if you're not sure - which can be done without having to rebind the HR92's.