Yes. Just to be clear, if you make an instance of the EggTimer contraption and edit it's script, it will have a template like
on finish do end
You can then fill in an event handler for "finish" like you would any script. For example,
on finish do go["someCardName"] end
Note that if the only thing you want to do is wait 10 seconds after clicking a button before navigating to another card you could use the sleep[] function on an ordinary button's script:
on click do sleep[10 * 60] go["someCardName"] end
The difference being that sleep[] is "synchronous" and prevents the user from doing anything else while the script sleeps, whereas the EggTimer is "asynchronous" and the user could click something else or navigate away from the timer before it goes off.