Since the male is the first one at a nesting site I’m guessing that’s who this is.
This spot looks terrible for building a nest, no branches for support, just hanging in the air. However, it actually has been used for 3 years that I know of. The tree itself, surrounded by water, is important.
Most Heron nests look to be a big pile of sticks. They last every year (most do anyway) through storms regardless of how flimsy they appear.
Below is a wider view from further back.
That definitely looks like a precarious perch. It looks like the herons will have to do some weaving of the sticks to hold the nest together.
I’m not sure how they do it, but they do. And… that tree will have 2 Heron nests and probably 2 Great Egret nests. All within feet of each other. Too close, and at times it does not end well for somebody.