I believe there is a small section on Systems Manager. If you do not have an Apple/IOS device, you don't get much out of that section from my recollection as it has you skip 2 of the three parts in that exercise.
^correct, it is optional. The CMNO does a pretty good job of covering the full Meraki stack at a high level. I also think you can get some licenses free for Systems Manager if you're below a certain amount if you just want to experiment with some devices to learn on your own.
Adam R MS | CISSP, CISM, VCP, MCITP, CCNP, ITILv3, CMNO
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