There is no delaying of the decision. They have a deadline of tomorrow and that is an internal agreement between companies. You can tell the world at a later time! Everything goes down the wire everywhere in life. Hess is a huge company and has lots of items to consider and internally debate I am sure.
With the TSX-V Exchange closed on Monday for Canada Day, news will not be released until Monday night or Tuesday out of respect for the share holders with stocks bought/held on the TSX-V because that is the home hub for stock trading on this stock.