If you are running CMOD on non-mainframe, and your reports are generated in JES on the mainframe side, you need to work with your MVS systems Programmer to find out the options and whether you are entitled to use MVS Download. If so, your system programmer needs to set up a started task to push the reports to your system via MVS Download.
On the server side you will configure arsjesd to receive files sent by MVS Download.
There may be other alternatives but this is a very reliable and fast method to move files to non-mainframe platform from JES SPOOL.