What can I monitor if the Laravel queue is running?

I can start the queue as such:

php artisan queue:listen

This works fine, but I would like to monitor if the queue is running, especially important as there doesn't seem to a fallback if it's not.

To be clear, if I queue an email through a controller, like so:

$this->mailer->queue($view, $data, function ($message) use ($toEmail, $toName, $subject) {
    $message
        ->to($toEmail, $toName)
        ->subject($subject);
    });

This will successfully run, but if the queue is not 'listening', the job gets pushed on to the job table, forever.

I am looking for something like \Queue::isListening();

via Chebli Mohamed