To check if your NSCP Client and script is working as expected, you can trigger a similar statement as below from your Nagios environment:
cd /usr/lib/nagios/plugins
./check_nrpe -H <HOSTNAME> -c <thepowershellscript>
If the check_nrpe is missing, make sure you installed the “nagios-nrpe-plugin” plugin on your Nagios server!