Powershell Script to Find Workflow Running Instances in SharePoint Site

#List all workflows Running Instances in SPSite
Add-PSSnapin Microsoft.SharePoint.PowerShell -ErrorAction SilentlyContinue

$siteURL = read-host "Enter the site URL"
$web=Get-SPWeb $siteURL
$lists=$web.Lists
$wf=foreach ($list in $lists)
{
   $list.WorkflowAssociations | where {$_.RunningInstances -gt 0}
}
if($wf)
{
   write-host "Workflow running instance found" -fore green
   $wf | select Name,ParentList,RunningInstances | Format-List;
}
else
{
   write-host  "No workflow running instance found" -fore cyan
}
$web.Dispose();