Ethereum developers have planned to activate Istanbul hard fork in the main network to block # 9 056 000.
Miners will get its tentatively December 4th. In case of unforeseen circumstances, the hard fork will be postponed to January 8.
In this case, the developers believe that nothingshould prevent timely activation. They also approved the EIP 2124 upgrade, which allows users to determine which chain the majority supports.
Read more about Istanbul updates here.
Ethereum developers approve upgrades for Istanbul hard fork
Recall, the hard fork in the test network led to the division into two chains.