You can see here the total BNB amount of your bids for an auction.
Each time a new bid is accepted, you will earn BNB calculated as:
New Bid * 50% * (Total BNB of Your Bids / Total BNB of All Bids)
This number will keep growing each time a new bid comes in. So, sit back and enjoy this stream of passive BNB income. You will see the total BNB rewards earned by you from an auction under the "If Round Ends Now" section.