If it's just the version you'd want to check, you can simply open SmartView Monitor R77.30 or SmartConsole R80.x > Gateways & Servers to get a list.
Checking the specific Jumbo Hotfix version is a more advanced topic. I assume you have many different versions and Jumbo Hotfixes in place. Therefore, please read: How to check which Hotfixes are installed on a Check Point machine and the Jumbo Hotfix Accumulator FAQ first. The method of checking your version depends on the version level.
Useful commands (not complete):
[Expert@HostName:0]# cpinfo -y all
You can automate checking all your gateways from your central security management via: cprid_util