How to easily see who is out of office in M365/Outlook today

My boss wants an easy way to see who is out of office for today (everyday he looks he want to see who is out of office today). We don't make use of Teams that much yet, so many are always offline on it, so we can't use that to see the present list.

The goals is to create an overview of who is marked out of office today and no need for the details, just the names of the unavailable people. Yes my boss really wants it and I can't get him over to not wanting it. We used to have this in our old system as well we used before we went over to M365.

I know I could manually check the Scheduling Assistant or shared calendars, but are there any other better ways? Since We don't want to make use of shared calendars and with scheduling Assistant it will be a bit of a mess with the 75+ employees we have.

Any tools or options or methods that are recommended?

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Edit:
Thank you all for replying and trying to find a solution.
We will probably try to use the HR system for people who clock in, yet not everybody always clocks in. It won't always be accurate anyway.