Celtics now 17th on offense and 9th on defense according to cleaning the glass, which filters out garbage time.
The offense is still being pulled down by mediocre 3 point shooting, they are at 31.9% as a team. So that should improve. Defense has been great, but still 30th in OReb% allowed (but the gap closed a bit last night).
I think if they generally play like they have these first four games, but the 3 point percentage finds it level and the OReb% isn't historically bad then they be fine. If those things hold they won't be a tank team.
Of course an injury to really any of Brown/White or even Queta would be devastating. So they're always going to be one bad play away from tanking.