He might be close, but we as fans should hope for the best for our prospects in terms of development. If Dorion can make one move to bring in a decent defenseman for the rest of this season, it could give us flexibility to send Thomson back down to Belleville to continue improving his game to the point where it becomes undeniable that he is ready.
At the end of the day, this guy was only drafted 2-3 years ago in 2019 so it's not like he is some under-achieving first round pick that has been toiling in the minors for 5 years, I definitely think playing another 50 or so games in Belleville before coming back up full time is the right path to take.