Shapella will take effect at epoch 194,048, which is scheduled for 10:27:35pm UTC on April 12.
Source: https://cointelegraph.com/news/withdrawals-are-coming-ethereum-devs-confirm-epoch-for-shapella-fork
‘Withdrawals are coming!’ — Ethereum devs confirm epoch for Shapella fork
March 29, 2023
CoinTelegraph