Remotely initiate windows updates

I have a network with countless workstations on it and the windows updates are done through WSUS in push cycles to allow us to use a generic image and configuration and avoid network congestion.

I have a number of workstations in storage that are connected once a month for a few days to recieve updates, however not all of them fall within their push cycle.

I want to avoid going to each machine and clicking "check updates" as that would require me to connect a monitor, mouse and keyboard.

Is there a way (preferably through powershell but im open minded) to initiate a check and install of updates on a remote system? Lets say for 1 system at a time right now, I can add a file reader and a look later.

NOTE: the configuration of the WSUS server is above my pay grade, im simply being asked to ensure these machines are updated.

Thanks for any help or hints