Sorry for the late reply. You can track the stETH token balance ($2,798.60 | stETH (stETH) Token Tracker | Etherscan) and relate it to the ETH2 deposit contract (Eth2 Deposit Contract | 0x00000000219ab540356cbb839cbe05303d7705fa).
This will all be part of future Lido upgrades/iterations when more functionality/transfers are available on ETH2. For now, the DAO would just be able to deny them adding new keys.