So Shen's rework is coming after Taric and Poppy?

So your better off waiting for Yorick to be reworked? Don't worry though, Yorick rework will come out with the Ao Shin release that'll happen any day now...... (fully stacked tear)

There's multiple scales of reworks happening all at the same time. If the Shen rework isn't a full-scale Sion-level rework, it's not on the same timeline as Poppy/Taric.