How to add Optimism to mainnet?

Could you please elaborate on the process of integrating Optimism into the mainnet? I'm particularly interested in understanding the technical steps involved. What are the prerequisites that need to be met? Is there any special hardware or software required? Additionally, how does Optimism enhance the functionality and performance of the mainnet? Would there be any potential challenges or risks associated with this integration? Finally, could you provide any insights on the estimated time frame for completing this process? Thank you for your assistance.