How to find out which site collection is using RBS ?

$SPWebApp = Get-SPWebApplication https://abc.com

foreach ($SPSite in $SPWebApp.Sites)

{

    if ($SPSite -ne $null)

    {

        $site=Get-SPSite $SPSite

Ssite

$dbname = $site.ContentDatabase.name

$dbname

$rbss=$site.ContentDatabase.RemoteBlobStorageSettings

#$rbss

        $SPSite.Dispose()

    }

}