The execution of the rsync task is shown in /var/log/cron.
Any messages are put into /var/log/messages.
By default, rsync will produce no output when no files need to be transferred.
Therefore, if all is well, no messages go into /var/log/messages.
So if you want to see output in messages, you will need to add an optional parameter of "-v".
Sample command line taken from the cron log with the added -v option: /usr/local/bin/rsync -r -t -z -v --delete-delay --delay-updates -e "ssh -p 22 -o BatchMode=yes -o StrictHostKeyChecking=yes" xxxxx@someone.org:\""/mnt/remote_location/"\" "/mnt/local_location"