The launch of the Ethereum Shanghai upgrade on April 12 will allow the network to complete its transition to a proof-of-stake model, enabling users who staked ETH in the network to withdraw their assets and accumulated rewards.

However, users may not be able to withdraw their funds immediately or all at once, as the length of the withdrawal queue could result in users having to wait several weeks. 

To date, more than 18 million ETH, worth about $33.6bn, has been staked and locked into the Beacon Chain across 564,000 validators, with an annual percentage yield of 4.4% for validators.