Ethereum Mainnet is currently targeting the Berlin fork for April 14 at block height 12,244,000. Before mainnet the fork will be applied to the Ropsten, Goerli, and Rinkeby testnets; if any issues are discovered the target date for the Mainnet fork may change. "After months and months of planning, Berlin is finally here! The upgrade, which follows the Istanbul and Muir Glacier upgrades, is scheduled to go live on the Ethereum mainnet at block 12 244 000. We expect this to happen around Wednesday, April 14, 2021, but because of block time variability, the exact date may change."