The way to see the best detail of that is on the fitbit.com dashboard.
Click 'Dashboard' near top right of this screen. On the wide graph with 2 drop-down menus at right, select heart rate and Daily. That show graph of heart rate. Move cursor over graph and it displays reading at 5 minute intervals (don't know if average or individual readings).
You can see similar graph on phone app from heart rate tile but, at least for me, much easier to see detail on fitbit.com dashboard.
Before posting, re-read to see if it would make sense to someone else not looking at your Fitbit or phone.
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