A toggle doesn't provide a workaround to tracking state, so it's possible that you'll issue he command with no effect. Setting ON when the relay is already ON. And you don't need to nest macros to toggle a relay, you can just create a single toggle macro with relay on and off in it. :)

You're right about using the voltage sensors though. I could jump a wire from the relay to one of the sensors to know when it's energized. I just shouldn't have to.