The peak of the Geminids is predicted for this year on December 14 at 04:00 UT, which works out to about 2 pm our time. The radiant for the Geminids is highest in your sky around 2 am on the 14th, so the best time to observe would be from midnight to dawn on the morning of the 14th. If you wait for evening, the radiant will be below your horizon, so you likely won't see any Geminids until after midnight.