Get pending windows updates.

Get-AvailableUpdates.ps1

function Get-AvailableUpdates {
    [CmdletBinding()]
    Param()

    $wu_session = New-Object -ComObject Microsoft.Update.Session
    $wu_searcher = $wu_session.CreateUpdateSearcher()
    $updates = $wu_searcher.Search("IsInstalled=0 and Type='Software' and IsHidden=0")
    return $updates.Updates `
        | Select Title, RebootRequired, IsInstalled, IsDownloaded, IsHidden, IsPresent, `
        @{Name='KbArticleIds';Expression={$_.KbArticleIds}}, `
        @{Name='CveIds';Expression={$_.CveIds}}, `
        @{Name='Size (MB)';Expression={[math]::truncate($_.MaxDownloadSize / 1MB)}}
}