The Salt Minion can initiate its own highstate using
$ salt-call state.apply
This will cause the minion to check in with the master and ensure it is in the correct "state".
If you would like the Salt Minion to regularly check in with the master you can
use cron to run the
0 0 * * * salt-call state.apply
The above cron entry will run a highstate every day at midnight.
When executing Salt using cron, keep in mind that the default PATH for cron may not include the path for any scripts or commands used by Salt, and it may be necessary to set the PATH accordingly in the crontab:
PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:/opt/bin 0 0 * * * salt-call state.apply