The Ethereum Foundation has not set a mainnet launch or activation date for the Glamsterdam upgrade.

From the articleEthereum Gas Limit Rises as Glamsterdam Moves to Hoodi Testnet - BlockonomiAlso in Ethereum Eyes Massive 3.3x Gas Limit Boost as Glamsterdam Approaches - U.Today, Ethereum sets October 26 for Hoodi’s 200 million gas test, Ethereum's next upgrade has a date on Hoodi, but not on mainnet