I live in OK and there are more and more breweries popping up but unfortunately with our whack laws here breweries can not do "tours" per se but at the same time I have had most of them open the doors to me if you let them know you are "coming by." COOP Ale Works is a fast growing brewery here in OKC that is worth a visit. Not sure what route you are going but Marshall Brewing Co in Tulsa is another good one. Bricktown Brewery as FlyinBrewer suggested is alright. Last I checked, in OK "Brew Pubs" can't serve beer over 3.2 ABV so they are a bit limited there. Battered Boar is another one that is relatively small and located in Edmond, OK (north of OKC). Choc is a pretty well established brewery too in NE OK.