For services that offer real-time data, the usual icons will have added signal waves and "Real-time". It looks like this in the trip overview:
You will usually also be able to see the vehicle moving on the map.
See the related issue "Icons indicates real-time but there's no vehicle on the map" if the real-time icons are present but the map doesn't show the bus/train/tram/etc.
Please note that even if a provider supports real-time data, not all services will have real-time data enabled as the particular service might be lacking the technological equipment, the equipment failed to make a connection to the central server or the driver did not (yet) log into the system.