That is actually implemented.
When clicking the button a toast container is created. unfortunately the naming is to generic so when your template (like mine) is also using toast messages, it will (in my case) not display.
For the next version i have refactored that to a different method: even when the toast worked it was visually different from the toast on the template.
On my site you can see the new functionality: when clicked the button turn green and gives a "[check] Copied" text for 3 seconds.
still testing this, so if you have a better way to do this let me know.
