AppCmd filter to running sites

AppCmd filter to running sites

I have a script that uses appcmd to find sites using a particular vdir and
iterates through them to find which ones are currently running
appcmd.exe list vdir /physicalPath:Z:\My\Path
:: save sites to array
:: foreach SiteName in array
appcmd.exe list site SiteName
:: hunt for "Started" in the output
but I would like to directly filter down to running sites using said
virtual directory. I have expectations that there's a /parameter:value
that does exactly that, but I can't seem to find a list of possible
parameters.
Best would be arguments on the list vdir call that render the list site
unnecessary.
Second best would be a filter on the list site call that removes the need
to hunt for "Started"