Jack Smith recently requested that the Supreme Court decide quickly on the immunity claim made by Trump and just now the court offered a one-sentence order that they won't take up the case. So it is left to the Court of Appeals (Jan. 9 hearing scheduled). This is parallel to the Nixon refusal to respond to the subpoena for the White House tapes - the Supreme Court was asked to decide ahead of the court of appeals, and they did so. Nixon had to hand over the tapes.

Trump is into delay delay delay, so this is the Supreme Court dragging its feet that can benefit him (there is no information about the makeup of the members as far as this order - 5-4 or all nine, etc.)