Congrats on a perfect timing for fruit! For me, it often happens during November, then they get grazed by our frost in January right before they are plump, so I often have to throw out the top hand.
The demands of nutrients apparently don't change DURING fruiting, according to several books I've read over the years. When the plant needs the most nutrients is from 2 months before fruiting up until the flag leaf emerges. This is when the Musa is storing up all of the energy for fruiting. The available nutrients, water, warmth and sunlight are most crucial at that point.
The bottom line: When the plant is in fruiting process, it's simply releasing all of the energy stored up in the form of flowers and fruit material. So - you can continue to fertilize it to help nurture any/all of the pups that tend to emerge before the fruit set has completed.
Good Luck!!!!
