Sorry, no - the thermostat makes the call for heat, but doesn’t know what the furnace actually does - there is no feedback loop from the furnace controller back to the Ecobee. In most cases, however, when the thermostat calls for heat, the furnace will turn on, and when it stops, the furnace will turn off - in between the furnace runs constantly in most cases. When the call for heat stops, the fan may continue to run to push the remaining heat out of the ductwork, but that is up to your furnace controller and/or how you configured your ecobee.
You might get more info from
equipmentOperatingState, but it’s all still what the thermostat is asking of the furnace, nothing comes back from the furnace. For the possible states in
equipmentOperatingState, check the Ecobee API documentation.
You can also see what the Ecobee thinks is going on by logging in to your account on ecbee.com, then Home IQ, System Monitor, Download data. This gives you the state and operating durations in 5 minute increments.