This app doesn’t control the “time” it sends the email. That’s up to the server (queue, etc). You click in button, it runs the script and the email is sent. That’s the end of this resource flow. What happens after that, isn’t controlled by this resource. Btw, the version before the latest only added a checkbox in the form. Nothing else changed.
I tested and I received the email. Will test it again later and will reply back.