Geyser control on or off

How do I know if the geyser is on once I have set up a schedule by looking at the controller?

The LED light will pulse pink/blue combo …the booklet supplied with the unit gives LED colour meanings

Like Silver_212 said, the LED is one way, or check the status in the CBI app. And on the “Electric” screen you can see if the element is actually drawing power (see below).
I linked my Google Home mini and get a verbal a response to “Hey Google, is the geyser on?”, “Yes, the geyser is on”.