Ethereum core developer Tim Beiko reiterated that a specific date for the merger has not yet been set, and will only be determined when the client team is confident that the software implementation has been thoroughly tested and that there are no bugs.
Separately, Tim Beiko stated that as of April 2022, all client teams are working on a merged implementation, including the launch of a new testnet and testing of shadow forks. Among them, the shadow fork running against the existing testnet and Ethereum mainnet has revealed implementation issues on the client side, which are currently being fixed by the team, and the shadow fork is periodically rerun to test the fixes.
On April 13th, Tim Beiko tweeted that it is strongly recommended not to invest more in mining equipment at this time, (the Ethereum merger) will not be completed in June, but it may be in the next few months, there is no certainty at the moment. date, but we are definitely currently in the final stages of Ethereum PoW and will be done within 2022 (Ethereum merger).