Notification for Expiring/Expired Certs

Hi Everyone, I'm not a hard core BigIP guy but I'm getting ramped up. My first issue is to have a notification prior to ssl certificates expiring. So I did some searching and found SOL3727. So I made the changes, and to test I ran checkcert -s and then I found entries sent to my syslog server showing which certs are about to expire, so thats great. Now the problem I have is that this suppose to be automated. I thought that checkcert suppose to run via cron.weekly. But its been a few days, not a whole week, and I still don't see that it ran. Is there something I'm missing here? We're running ltm 3600, code 10.1