Just found an interesting opinion on his future contract on Sportrac. Two things worth noticing - they are projecting him to potentially massive extension, but at the same time, they are saying that his 6th round pick status might in fact lower the numbers.
https://www.spotrac.com/news/_/id/2476/5-looming-nfl-extension-candidates
Christian Benford (CB, Bills)
One of the best kept defensive secrets in football, Benford is in the midst of putting together two of the better back-to-back seasons among active cornerbacks. The former 6th round pick is playing out his third season in Buffalo, making him extension-eligible for the first time after 2024.
Mathematically speaking, Benford (4 years, $98M projection) now joins Trent McDuffie, Derek Stingley Jr, & Sauce Gardner as cornerbacks who could reset this market in the coming months. Though it should be said: 6th round picks rarely swim with the big fish when it comes to rookie contract extensions. Don’t be surprised if Benford’s deal pales in comparison to these 1st rounders when it’s all said and done.