Add delete function into existing stale account PowerShell script

Greeting Experts!  I'm including the existing script that I'm using to clean up my AD environment and now need to tweak it to include the ability to delete accounts that haven't logged in for at least 120 days.  The first part of the script audits the users accounts and if they haven't logged in for 60 days, disables them and moves them to the "Inactive OU".  I need the new portion of the script to just check the "Inactive OU" for accounts to be deleted.  When the account is deleted, I need to have the date logged when the last time the account logged in.  

Thank you for your help Experts!

# Stale user accounts 

Import-Module ActiveDirectory

$logPath = "C:\Tools\Scripts\Stale_Accounts\Logs\Stale_Users_"  #directory to log output
$Date = Get-Date
$TodaysLog = $logPath + $Date.ToString('yyyy_MM-dd_HHmm') + ".log"
$FilterDate = $Date.AddDays(-49)

Function WriteLog($message) {
    $message = (Get-Date).ToShortTimeString() + " - " + $message
    Add-Content -Path $TodaysLog -Value $message
}

$disabledOU = "OU=Users,OU=Inactive,DC=local"

$StaleUsers = Get-ADUser -SearchBase "OU=Depts,DC=local" -Filter * -Properties SAMAccountName, lastLogonTimeStamp |
    Where-Object {[DateTime]::FromFileTime($_.lastLogonTimeStamp) -lt $FilterDate} 

If ($StaleUsers) {
    ForEach ($User in $StaleUsers) {
        try {
            Disable-ADAccount -Identity $User.DistinguishedName -ErrorAction Stop
            WriteLog -Message "Disabled $($User.SAMAccountName)"
        } catch {
            WriteLog -Message "Failed to disable $($User.SAMAccountName): $($_.Exception.Message)"
        }
    
        try {
            Move-ADObject -Identity $User.DistinguishedName -TargetPath $disabledOU -ErrorAction Stop
            WriteLog -Message "Moved $($User.SAMAccountName) from $($User.DistinguishedName)"
        } catch {
            WriteLog -Message "Failed to move $($User.SAMAccountName) to $($disabledOU): $($_.Exception.Message)"
        }
    }
} Else {
	WriteLog -Message "No stale user accounts found."
}

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