Long working hours

Awoke to sounds of machines harvesting maize in the still dark early morning. So took this photo while making my coffee. The harvesting machine was moving across the skyline being attended by a fleet of huge tractors and trailers.
And they were still working out there, again in the dark, at 8 this evening. During the day, I saw three deer run across the lower field - maybe flushed out of the tall maize?