NBN roll out date is determined by NBN Co, if you want to know the estimated NBN roll out time frame in your area you may visit https://www.nbnco.com.au/residential/learn/rollout-map.html. Or you can provide your complete address via PM so I can check it for you.
In case you need a reference:
How do I private message (PM) in the community
TPG will be happy to contact you once NBN is ready at your address, simply register your details here: http://tpg.com.au/nbn#register-your-interest