“Appointed” appears to be a key word. If a recount is not finished in time, then, it seems to me, that no electors are appointed from that state. The majority would therefore be a majority of those who are appointed to actually vote. But Clinton will be working on bribing, blackmailing, and intimidating the remaining Trump electors, too.
If WI, PA, and MI are unable to appoint electors due to this nonsense then the number of appointed electors is not 538. It would be 492. A majority in this scenario would be 247.
The Twelfth Amendment (Amendment XII) to the United States Constitution provides the procedure for electing the President and Vice President. It replaced the procedure provided in Article II, Section 1, Clause 3, by which the Electoral College originally functioned. Problems with the original procedure arose in the elections of 1796 and 1800. The Twelfth Amendment refined the process whereby a President and a Vice President are elected by the Electoral College. The amendment was proposed by the Congress on December 9, 1803, and was ratified by the requisite three-fourths of state legislatures on June 15, 1804.