The standby list, upgrade list and oversold list are one and the same. It's called the 'Priority list' and either the ticket counter, Admirals Club or gate agent can list you. Mention that 'if you need volunteers today, I'm happy to help if required.'

If the flight requires volunteers, the seats for passengers tagged as 'VOL' are released and passengers who are 'OS' (oversold) are accommodated. You need to be at the gate for the agents to process your transportation vouchers, rebooking, etc.