This is not consistent with what I'm seeing. Monday before 2 pm nothing happens. Between Monday 2 pm and 5 pm suddenly everybody wants to get 2 days of work done and fails. And tuesday normal, regular, productive work starts, and continues until Friday. Usually the tough thing is on oneself to really stop between 5 pm and 6 pm because then the productivity drops severly.
My guess would be from these observations, that the most success happen Thursday around 3 pm. But maybe software development is special since there are few tasks that could be done in 1.5 hours anyways.