Honest to God, you submitted 11 days ago, there's 10 working days processing and you're already characterizing it as an unusually long time. Take a valium.
Ask at your local immigration office how long a lease they want for a residence certificate. You'll need to show 800k for each of you, preferably in separate accounts, it's possible that the AUS consulate will accept 1.6M in a joint account for the initial non O, you'll need to ask them. Thai bank account is probably individual, the days of dependant Non O are pretty much gone, especially as she is over 50. Renew indefinitely as long as you meet the requirements. If your embassy will provide an income verification letter (which I'm not sure they will) it doesn't matter where the income comes from. The rules are clear, funding money in bank accounts nothing else.
If in a foreign country then a passport entry stamp and your hotel booking etc. if in your home country then utility bill, bank statement with your address, or drivers license etc.