Thanks to the info in this thread my waitlist cleared at T-10 days from J to F.
Notified via email and I called to pay the difference in miles and taxes. Both were charged but agent unable to issue the ticket. They said they need to send to back office as it's not recognising the miles as deducted. Agent says it's common issue for awards being upgraded with miles and should take 24 hours. Now the nervous wait until etickets arrive...