I've seen the following screenshot showing the time zone in the info display in the new photos app.
I can see how to see the time zone if I use the adjust time and date, but it doesn't display in the info display box.
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it's actually a setting in "date&time" in your system preferences.
Open it and then in the "date&time" section, click on "open language & Region", then "advanced".
Click on "times" section and add/drag "time zone" to the "short time" format.