Resolution source for wealth is forbes https://www.forbes.com/real-time-billionaires/ list

At time of writing 2 Dec 2024 Elon Musk had just passed $333.3bn.

So $166.6bn further to go to be a 'half trillionaire'. Maybe someone else will overtake him?

UTC year end time will be the cut off. It is possible that periods when true are missed, so it may well be when there is first a comment here with good evidence that it has happened rather than when it first occurs.