Cron jobs are just unix commands or scripts set to run at a certain interval.

Therefore in general it is difficult to check what processes are from cronjobs.
If you really need to check which cron jobs are running you will have to see which process belongs to "crond" process.

However if you just wish to see the "Schedule" use

crontab -l
to see the current user's scheduled jobs

if you have root priviledges

you can
cd /var/spool/cron/crontabs

for a list of all users scheduled jobs

Hope it helps