Superblocks Lab allows you to deploy to Mainnet directly from within the tool. There is no need to have MetaMask as you can simply use your own 12 mnemomic wallet instead.
In order to do so:
1. Go to the "Accounts" section of your project.
2. Click on any of the available accounts and changed the value to "private" inside the "Wallet" section.
3. Finally select the address your private wallet is in.
4. If your private wallet is unlocked, you should be able to see the address of your wallet.
NOTE: If after selecting a private wallet and the right address you get a message saying "Address not visible since wallet private is locked", make sure your private wallet is fully unlocked and ready to be used.