There's very little chance to be honest - on domestic flights in the US, CO has a policy of filling F by upgrading its own elites for free; there are various levels of priority within this, but basically it means that there is very little op-upgrading done. The only time I can see this happening is if Y was very oversold, and there were no more CO elites to upgrade.
Sorry to disappoint you, but it doesn't look good! Best thing I can suggest is to check in online early and try to get a good bulkhead / exit row seat...