According to the developers of the project of the ETH fork based on PoW, the launch of the mainnet of the Ethereum fork based on the Proof-of-Work (PoW) consensus algorithm will take place within 24 hours after The Merge.
They have said that they will announce the exact time one hour before the start of the mainnet and start the countdown timer.
After The Merge, 2,048 empty blocks will be released on the network in order to ensure the chain ID switch is successful.
The initial difficulty of mining on the network is expected to be at least 220 T, which corresponds to 15 TH/s in terms of hashrate.