Costello posts a short recap of yesterday's practice. https://nypost.com/2021/07/28/jets-training-camp-run-game-gets-off-to-ideal-start/
Day 2 Recap along with a short video from ZW after he signed his contract. https://www.newyorkjets.com/news/jets-practice-report-qb-zach-wilson-s-time-is-now
Since Herndon is basically an oversized receiver with the yips, I would think a signing like this would make him expendable.