A common question is "Why is there no crontab for the production server/instance?"
Although it may appear that there isn't a crontab set when logging into the production site via SSH and running
Rest assured there is a crontab is there an set for site. See the Cron Component information for the default crontab for your instance.
The reason you can't see the crontab from SSH is that cron is ran in a different container to the PHP-FPM container. This affords quite a few benefits including but not limited to, the ability to recreate/reapply cron jobs without effecting the PHP-FPM container.
If you wish to get confirmation of your crontab, you can always raise a support ticket and we can give you the exact crontab in use.
Alternatively if you wish to get a log of your cron jobs you can simply suffix them with something like
>> var/log/cron.log 2>&1;
Which will output to the file ~/htdocs/var/log/cron.log in SSH.