It's all about trust.

Can he progress to the point where Dak trusts him to run the right route, the exact way Dak needs him to run it, and catch errant passes reliably?

Can he build the trust with the coaches to consistently execute his assignments without making boneheaded errors leading to penalties (offensive holding, block in the back, not lining up correctly, etc)?

If he puts in the work and shows progress in those areas, he'll get plenty of opportunities. If not, he'll be just another lower round player that didn't pan out.

He looked lost and made boneheaded mistakes in last preseason. We'll see soon enough whether he's learned and improved. I doubt he'll ever be as versatile as Wilson, though. Wilson was a high school QB that had that insight and skills for being a reliable receiver and a very good gadget player. Fehoko is more of a Noah Brown type receiver, big, blocker, ST's stalwart with the occasional reception as a 3rd or 4th option when the DB's are once again sitting on the repetitive primary receiver routes.