How can i know if WP-cron.php is running?

I wont talk much about wp-cron.php running internal, because that can turn into long post.

Problem:
I have disabled wp-cron.php in wp-config.php and wp-cron.php is now not running all the time (killing the server). So i set up a cron job in hostgator:

php -q /home/username/public_html/website/wp-cron.php

And i m waiting to receive email, but i only receive email with problems, (only websites where i have specific plugin which sends headers too much i sending me cron job notifications about this error) all other websites are not sending any email. So how can i make sure if wp-cron.php is running?

And is there a way to run it manually locally, maybe by navigating to the specific file?