I suspect CBS wants to avoid the Winter Olympics period, but TAR did run through those periods in 2002, 2006, 2010 and 2014, so there’s nothing stopping that.
CBS probably wants to have TAR avoid the CBS portion of March Madness (as Turner has the later rounds now) but that at most would be the first week.
My guess is that Celebrity B.B., which is intended to be much shorter won’t run for more than a month, and probably on against the Olympics.
My best guess is March with one or two back-to-back episodes so it ends during the May sweeps. But for the Winter Olympics, IMHO, that would have been February.
And did Undercover Boss even get a new episode order this year? Not sure that they did, there were so few of their episodes last season, it may be on a time out.