If he doesn't come back this week, I don't see him returning for a road game especially with 3 tough teams. If not, it probably will be 3/14, just like his contract (314M) and the St. Louis area code.
March 14th is a start of a 7-game stretch with 6 being at home, and no back-to-backs, so I think it will be then if it is not Wednesday.
March 14 (3/14) is also Pi day (Pi being the irrational number that represents the ratio between the circumference and the diameter of a circle). Not sure the possible metaphorical significance of that, perhaps that Tatum has come full circle?
March 14 would be fine with me. If it gets much later than that, you have to start wondering if it will happen at all. The last game of the season is on Apr 12. There would be 16 games remaining, including the game on March 14. That still seems like enough for him to be ready for the playoffs, but not sure it can be much less than that.
Then Tatum would not be dragging this out in the first place and just say out loud "hey I'm sitting out for the rest of this season" and be done with it.
The only thing I will allow would be if, god forbid, he suffers a serious setback at some point during the rehab/practices that changes the outcome and so he's forced to sit out the season. Otherwise, yeah he should be back.