The Supreme Court really is dragging out Trump's crazy immunity appeal ruling to the greatest extent possible, as they've now fully guaranteed that the D.C. trial has no chance of proceeding prior to the election, regardless of their actual ruling. And fully assuring that the case will never proceed if Trump wins.
For all practical purposes, they have aided and abetted Trump in his crimes, at the very least massively delaying any prosecution for his crimes in (1) just hearing a case that should have had zero chance or consideration of granting Trump immunity from his "alleged" crimes, and (2) halting all court activity on the case while they pondered Trump's insane claim.