For general reference:

The Supermoon peaks at 11:32 UTC.

To calculate the time for your area:
-- add or subtract the appropriate hours from UTC.
-- if your area does daylight savings, add one hour to that result to get your local full moon time.

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A relative reference:

The Supermoon peaks(ed) exactly 4 mins after the timestamp on this post.
(Unfortunately for me, it is ~1:30 pm - have to wait until tonight.)

waves