Hi syntaxerror1
Normally when you update new content and want to show in the filter page on frontend, you need to save or index the filter.
The 'Cron Job' here will help you to index it automatically with the time you set in cron job settings. Your server often supports to run this cron job, you can contact your hosting provider and share them the 'Cron URL' in JA megafilter that you created and they will help to setup for you.
Regards