Most Early Decision and Early Action applications are due November 1 or November 15. For students applying to college by an early deadline, scores from the December (and occasionally November, or even October) exam will not be available in time. It is the student’s responsibility to find out colleges’ standardized testing deadlines, as they do vary.
No need to send any standardized test scores to colleges until senior year. Many colleges now allow students to self-report their scores on their application, in which case you don’t have to send official scores until you’ve accepted a college’s offer of admission. Confirm the policy of the schools to which you’re applying. Consult with your college counselor to determine if you should send your scores to any test-optional schools.