Looking for a script to get vpxa agent version

I am working with a customer that has a large number of hosts in several vCenter environments. In troubleshooting some issues due to a recent upgrade to VCenter 6.0 U3, I have a need to verify the vCenter agent version on each of the hosts. I can certainly login manually to each one and do something like this:

rpm -qa | grep vpxa

But I would much rather be able to do it through a script. Just curious if this is feasible. I can connect to the hosts in a look and get the appropriate service:

Connect-VIServer -Server MyESXi -User myRootUser -Password myPassword
Get-VMHostService |    Where {$_.Key -eq "vpxa"}

However I do not see a way to grab the version info. Hoping I am missing something stupid-simple that someone could point out.