I just logged into My Account via the below link and can see my usage. I'm on the unlimited NBN 50Mbps bundle offer so I suspect quite similar to yourself.
Once logged in, a scrolled down a bit past half way to the "other services" section where it showed my broadband and home phone and then clicked "show more" next to the Broadband Internet section. The next page shows how much usage I've used each day for this month only though, not historical. Will that suit your needs?
optus.com.au/myaccount
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I do not represent Optus. The views, opinions and advice expressed in my posts are my own
