The decision by the Supreme Court to take the case only grants Trump de facto immunity if he wins the election. If he loses the election, the trials continue and sooner or later he will go to jail. But if he were found guilty in the January 6 case on or about the time when he was nominated as the Republican candidate for president, he would still stand for office and if he won, the rule of law would end and he would be dictator for life.
So the fact remains, we have to beat him at the polls and we have to hang onto that victory in the Congress in whatever way we can so that Biden is inaugurated for a second term.
If Trump wins election it does not matter what happens in Georgia – even if the trial were held and he was found guilty, he would simply refuse to abide by the decision and deploy the military to quell any attempt to force him to abide by it.