Once the Republican-leaning states of Georgia, North Carolina and Pennsylvania (51 electorial votes) are counted in the tally, it will be 265 for Trump and 264 for Biden.
Nevada will be the tie breaker with its 6 votes.
If Biden takes Nevada and since the race was so close, Trump will start legal proceedings to investigate suspicious developments during the elections (think of Minnesota) and overseas military votes.
If Trump wins Nevada, it is game over for Biden.
The Supreme Court is in the hands of the conservatives now. The chances of Trump succeeding in bringing legal challenges or fending off Biden's legal push are not bad at all.