As soon as the upgrade succeeded, some people already included the mainnet—no need to rush on-chain. Glamsterdam was activated on Sepolia at 13:53 UTC on October 6 and finalized at 14:24 UTC. This round of testing includes ePBS, block-level access lists, and gas repricing. But this is just a public testnet; the Ethereum Foundation has not yet confirmed the dates for Hoodi or the mainnet, so regular ETH holders don’t need to take any action. Testnet success is an engineering milestone, not a mainnet rollout. Ethereum Glamsterdam