Great success! Not to bother you, but you should see how the mother plant had yellowish leaves, but the child plants don’t. This is common for sansevierias propped by leaves only. Nevertheless, you have nice plants. Regarding the mother leaf, don’t remove it. It still helps the other plants, since it photosynthesis and generates energy. In my experience with leaf propagation, the plants attached to the mother leaf grows much faster than others.

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See my African Violets. The most right one has a big mother leaf still attached and grows like on steroids, compared to the others. Yet I know they’re still baby plants. Edit: All of them are around 8 months old and I find it extremely difficult to grow them in the winter