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"New Horizons performed as planned today, conducting the farthest exploration of any world in history — 4 billion miles from the Sun," said Principal Investigator Alan Stern, of the Southwest Research Institute in Boulder, Colorado. "The data we have look fantastic and we're already learning about Ultima from up close. From here out the data will just get better and better!"

It is going to take a while to play all the data collected during the flyby down to Earth however.  Ultima Thule is as far from Pluto as Saturn is from Earth, and the data rates possible from that far away are in the low kilobits per second.  The many gigabits of data that were recorded on the spacecraft during it's flyby are going to take 20 months - nearly 2 years! - to all be pulled down.  The first low-res pictures are already coming down, with more (and higher-res) scheduled to finish downloading on January 2nd and over the next few weeks and months.

http://pluto.jhuapl.edu/News-Center/News-Article.php?page=20190101