If it's important, I've used https://cronitor.io/ https://cronitor.io/ in the past to make sure that it finished successfully (single monitor is free). If it's

If it's important, I've used https://cronitor.io/ https://cronitor.io/ in the past to make sure that it finished successfully (single monitor is free). If it's unimportant, I'd probably just use a Slack webhook like pigpigs mentioned or a growl notification.