Great question — answering as the UphillTech team:
This question hasn't gotten many answers because it is an odd situation. First it isn't normal to put schluter on the floor unless you are making a wetroom. You didn't say you are doing that. If you think the only place water will be and issue is the tub, then just add your baseboard when the walls and the floor are done and call it a day. (I usually caulk the bottom of the baseboard to the floor in a bathroom.) If the plan is a wet room, the schluter should have gone from the floor up the wall about 6 inches. You don't have that either. At this point I think it is useless to add any schluter to the bottom of the walls.
Full answer by RMDman: https://diy.stackexchange.com/a/302514 (CC BY-SA 4.0).
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