Here you can find the Power Swap Treasury address.
Select any treasury swap transaction.
In the JSON, examine the state changes in the call result of the treasury dApp address. The balance_Waves key shows the amount of Waves entering the treasury through swaps.
In the same JSON, examine the state changes in the call result of the PWR issuer dApp address (3PHEK5eM2RTwnrhWMzNxsAPANMoxamFH1GX). The minted_by_3PQn4BwNW1kcX1gagVHWxSP5RyQ3V9UYPT8 key value shows how much PWR the treasury minted.