We don't know if an omicron specific booster will actually work due to something called "Original Antigenic Sin". For more information, consult this: https://www.sciencedirect.com/science/article/abs/pii/S08968...

If you are eligible for a booster, then you should get one ASAP. The original coronavirus vaccine antibodies present in your body will cross-react, to a certain degree, with omicron.