Wait for the item to be present and proceed to the next step

Good Morning.

I am a newbie using kantu. I would like to do the following:

I am trying to instruct kantu to execute other functions, but I want to do it only when the “button element” is present.

The time of appearance of the element is variable. That is, the “button item” appears 2 hours, but then appears 4 hours later and so on …

My question is this:

What sequence of steps should I use to get kantu to execute some code when the “button element” is present under variable time conditions?

You can wait either with Computer vision or with HTML commands: