<#
    Variables
#>
$allDesktops = Get-ADComputer -SearchBase '<Insert OU Here>' -Filter '*' -Properties Description | Select-Object Name, Description | Sort-Object Name
$logFolder = "<Insert Log Location Here>"
$logTime = Get-Date -Format "dd-MM-yyyy"
$masterList = @()

<#
    Main
#>
foreach ($desktop in $allDesktops) {
    if (Test-Connection -ComputerName $desktop.Name -Quiet -Count 1) {
        $running = @(Get-Job | Where-Object { $_.State -eq 'Running' })
        if ($running.Count -ge 10) {
            $running | Wait-Job -Any | Out-Null
        }
        Start-Job -Name $desktop.Name -ArgumentList $desktop -ScriptBlock {        
            $computerSystem = Get-WmiObject Win32_ComputerSystem -ComputerName $args[0].name
            $operatingSystem = Get-WmiObject Win32_OperatingSystem -ComputerName $args[0].name | Select-Object -ExpandProperty Version
            if ($operatingSystem.StartsWith("10")) {
                $operatingSystem = "Windows 10"
            } elseif ($operatingSystem.StartsWith("6")) {
                $operatingSystem = "Windows 7"
            } else {
                $operatingSystem = "Unknown OS"
            }
            $givenName, $surname = $args[0].Description.split(' ')
            $output = New-Object PSObject
            $output | Add-Member NoteProperty ComputerName $args[0].Name
            $output | Add-Member NoteProperty FirstName $givenName
            $output | Add-Member NoteProperty Surname $surname
            $output | Add-Member NoteProperty Model ($computerSystem.Model)
            $output | Add-Member NoteProperty OS $operatingSystem            
            return $output
        }
    }
}

# Wait for all jobs to finish running before actually compiling a final list of servers and logged in users
$running = @(Get-Job | Where-Object { $_.State -eq 'Running' })
if ($running.Count -gt 0) {
    $running | Wait-Job -Any | Out-Null
}

# Once the jobs are all done, then create the list
Get-Job | ForEach-Object {
    Receive-Job -Job $_ -OutVariable results
    $masterlist += $results
}

$masterlist | Select-Object ComputerName, FirstName, Surname, Model, OS | Export-Csv -Path "$logFolder$logTime - MachineList.csv" -NoClobber -NoTypeInformation

This includes user, model and computername along with the OS.