Kevin Costner done at Yellowstone! (Probably)

Is Matthew McConaughey ready to don a stetson?

The New York Post says Kevin Costner is 100% done with Yellowstone at the end of this season. ET Online is also reporting the same news, independently sourced. This follows months of rumors surrounding his future with the hit show. Both reports acknowledge that there still isn’t word on when filming will resume on the final episodes of the season.

It se…