The margin of victory is the difference between the number of electors received by the winner and the runner-up.

For example, in 2020, Biden won with 306 electors and Trump was second with 232 so the margin of victory was 306-232=74. Here's a table for elections since 2000:

More than one of the options can resolve "YES". This question concerns how many electors are won (and not how they subsequently vote), so we should be able to resolve fairly soon after the election.