Officially on the clock. We've got 5 years to make the most of this era. No guarantees after that.
The four year extension with the 5th year option to give the player financial security is pretty standard. I don't think the Celts had much choice on that. We have Tatum for 5 more years. We don't want him to exercise that final year option because it would mean something has gone wrong for him.
I trust that Danny has a vision for what he's going to try to do over the next 5 years to maximize this window.
No matter what happens, we will have had Tatum for the first 8 years of his career, which are likely to include his peak.