How would the state determine who the electors should be?
You can announce the winner without announcing the tally.
As Jim Noble (courtesy ping) pointed out in his #32,
How will the states in the NPV compact define “the popular vote”?
Who would validate that enumeration? ABC News?
The National Popular Vote bill
“Article III–Manner of Appointing Presidential Electors in Member States
Prior to the time set by law for the meeting and voting by the presidential electors, the chief election official of each member state shall determine the number of votes for each presidential slate in each State of the United States and in the District of Columbia in which votes have been cast in a statewide popular election and shall add such votes together to produce a “national popular vote total” for each presidential slate.
The chief election official of each member state shall designate the presidential slate with the largest national popular vote total as the “national popular vote winner.”
The presidential elector certifying official of each member state shall certify the appointment in that official’s own state of the elector slate nominated in that state in association with the national popular vote winner. “