Yes, zkSync has recently launched its mainnet, marking a major milestone for the project and the Ethereum ecosystem. The launch of zkSync's mainnet represents a significant step towards making Ethereum more scalable and user-friendly.

zkSync is a Layer 2 scaling solution that uses zero-knowledge proofs (ZKPs) to enable fast and cheap transactions. It can process up to 2,000 transactions per second (TPS) and has gas fees that are significantly lower than those on the Ethereum mainnet. This makes it an attractive option for developers who want to build decentralized applications (dApps) that require fast and cheap transactions.

With the launch of its mainnet, zkSync is now available for developers to build on and integrate into their dApps. This will likely lead to an increase in the number of projects being built on top of zkSync, which will further improve the scalability and usability of the Ethereum ecosystem.

Overall, the launch of zkSync's mainnet is a significant development for the Ethereum community, and it highlights the importance of Layer 2 scaling solutions in improving the scalability and usability of the Ethereum blockchain.