Segnosaur
Penultimate Amazing
As another poster pointed out, they tend to release their rulings in late spring/early summer, so the decision will likely be released in late June/July.They probably have no intention to rule that POTUS has absolute immunity. They are just playing the delay game. Wait until say October to rule.
However, they don't need to wait to release it in October. The fact that they have taken the case at all has already messed up any court proceedings and made it unlikely they will be able to finish a trial before the election, which was the plan.
Even if they released their decision tomorrow, they would need to re-add the case to the court schedule (giving the defense enough time to prepare), deal with any legal proceedings that Trump's lawyers will throw at the case, then actually hold the trial (one which might be rather lengthy). And if they rush the case too much, they give stubby McBonespurs yet another excuse to appeal. (Not that he won't already be using every legal tactic he can... but you don't want any of these appeals to be successful.)