Zero bills. They all come on line, as do any reminders from medical, dental etc. If it is confidential, you get a request to log in -- a request, not a link. Same with statements from the bank.
For better or worse, it appears Australia (and some others) have moved away from paper faster than the US. For example, I was quite surprised about a decade ago to find Americans used cheques/checks. Hadn't seen one in years. They will be illegal here from 2028. About 90% of retail transactions do not use cash.
ETA: We still get letter deliveries, just less often and rarely useful.