You should also bear in mind that if you're leaving Australia permanently, you become a non-resident for Australian tax purposes, and any bank interest will be subject to withholding tax.
This page explains it: https://www.canstar.com.au/savings-accounts/withholding-tax-savings-account/
This para is relevant:
"The ATO explains that if you are a foreign resident, your Australian bank will automatically withhold tax on any interest earned on savings accounts.
The rate of tax withheld depends on whether you let the bank know your overseas address. If you provide an address, withholding tax works out at 10%. Without details of your overseas address, tax is withheld at 47%."