hi, you need to wait for the administrator or liquidator to make a declaration. you can check this website for guidance:
https://www.ato.gov.au/individuals-and-families/investments-and-assets/capital-gains-tax/shares-and-similar-investments/investments-in-a-company-in-liquidation-or-administration
https://community.ato.gov.au/s/question/a0J9s0000002ZhM/p00171736
you can follow the adminstrator's updates from here:
https://www.fticonsulting.com/creditors/bwx-group
there is a second creditors meeting scheduled for 24 May 2024.
i was only guessing as to CBA's repayment profile - probably best to wait for official announcements.