Hi @courtpt and @Saints78 - we have no exact word on when stock will be allocated out. If you check here intermittently, it shows whether we have online stock. You can also contact your local store here to see what stock they have available.
Be wary of ordering with Optus Online.
I ordered a iphone X with a watch recieved an intial confirmation with the watch on it only to be told after the phone was delivered that there were no watches. see https://yescrowd.optus.com.au/t5/Apple/Apple-Watch-3-Delivery-status/m-p/339116#M8499/jump-to/first-...
My suggestion is go to a store and they can do the same and they have stock and you can be guaranteed to have it unlike online ordering which seems to be a lottery.