Optimism support is already in Rainbow Wallet, just use a wallet address with assets on Optimism and you'll see it.
The OP Mainnet upgrade to the Bedrock release will take place on June 6, 2023 at 16:00 UTC!
There will be 2-4 hours of downtime.
See here for additional details.
Optimism support is already in Rainbow Wallet, just use a wallet address with assets on Optimism and you'll see it.