As of now, there is no official announcement from Coinbase about whether they are planning to list Matic or not. However, there is a strong possibility that they might list it in the future.
Matic is a Layer 2 scaling solution that uses sidechains to offer faster and cheaper transactions. It is compatible with Ethereum and works with any ERC20 token.
Currently, Matic is being used by some of the largest decentralized applications (dApps) in the world, such as Decentraland, MakerDAO, and Compound.
Coinbase has been listing a lot of new assets lately, so it would not be surprising if they decided to list Matic as well. If they do list it, it would be a big boost for the project, as Coinbase is one of the most popular cryptocurrency exchanges in the world.