Hi,
there are sereval way in how to check this.
PowerCLI
connect-VIServer "vcenter server name"
get-vm | % { get-view $_.id } | select Name, @{ Name="ToolsVersion"; Expression={$_.config.tools.toolsVersion}},@{ Name="ToolStatus"; Expression={$_.Guest.ToolsVersionStatus}}
C# client
Go to your Cluster --> Virutal Machines
You could add the Version status row of your vmtools by clicking on any of the available rows and mark the vmtools status row.
Same is possible in the webclient.
Frank