Any surgery on a QB's throwing arm is cause for major concern. But after Ben was placed on IR for the season The Athletic ran a paywalled interview with Jake Delhomme, who had Tommy John surgery.
Elbow surgery shouldn’t be a ‘death sentence’ for Ben Roethlisberger. Just ask Jake Delhomme
Not only did Delhomme fully recover from his elbow surgery, it was a rapid recovery. Delhomme was throwing a Nerf football within four months and cleared to play within seven months after what he called an “extremely easy rehab,” to the point where the most significant issue he dealt with was boredom.
Delhomme started all 16 games the following year and helped the Panthers to a 12-4 record, an NFC South title and a first-round bye in the playoffs before losing to eventual conference champion Arizona.
https://theathletic.com/1215918/2019...jake-delhomme/
Four months will have passed since Ben's surgery in late January. The Steelers and Ben presumably are not going to be posting video of Ben's progress on Steelers.com, but based on Delhomme's rehab schedule not having thrown yet does not necessarily raise any red flags.