As far as we are aware the AcuSense NVRs do not have any way of viewing the live CPU/GPU/Memory information of the device.
Under Maintenance, you should be able to view the live bandwidth usage of the NVR and under the Storage Management menu, you should be able to see the free & used storage.
I'm not aware of a command line solution, but this is not an area we really get into and maybe another forum user has more experience with command line and can give a more solid answer.