Come the end X Come at the end: Which is correct?

On Thursday, Chelsea met Monterey, from old Mexico and without thinking twice, beat them to gain the keys to paradise. European clubs have a 100 per cent winning record in the semi-finals of the Club World Cup and it was obvious from almost the very beginning of the match that there was little hope that that particular stat would be in need of alteration come the end of 90 minutes.

Extraí esse trecho de um jornal e gostaria de saber se podemos acrescentar, na parte em negrito, a preposição "at" depois do verbo "come".