Shoot, I thought this was an easy question, but it's not so simple. We can see that this column is a whole number type of "Time Zone" format. I also found there is a hidden table called timezonedefinitions, and it seems this is the key for you.

By running the below query, you can get a JSON output of all the time zones and their timezonecode values.
https://yourorg.crm.dynamics.com/api/data/v9.2/timezonedefinitions
After parsing out the JSON response, I can see an example of timezonecode 5 for Pacific Standard Time, which aligns to an event I'm looking at. Perhaps there's an easier way to find this, but this should get you there!
