Balancer v3 is in active development. Once the contracts have been deployed on this network this page will be updated. In the meantime you can take a look at the sepolia deployment.
These deployments were in use at some point, and may still be in active operation, for example in the case of pools created with old factories. In general it's better to interact with newer versions when possible.
# If you can only find the contract you are looking for in the deprecated section and it is not an old pool, try checking the deployments tasks to find it or ask in the Discord before using a deprecated contract.