Final update: My choice is made. After trying it out briefly, I am not convinced that the Fuji bird detect is what I am looking for. I have sent the X-H2s back. There were multiple reasons for deciding not to go with Fujifilm. Mainly it was because the subject detect AF was no where close to what I had seen of Canon, Sony and OM/Olympus in terms of performance. Second, it didn't feel quite as comfortable in my hands. the function button placement on the top right surface of the camera were hard to reach for my fingers. Finally, the base cost @$2500 plus the need to get CFExpress cards to get the full range of performance was more than I wanted to spend on something I did not absolutely love.
I just received the OM-1 this afternoon. Initial reaction is that it feels good in the hands. I have not yet had a chance to test the OM-1 in the field as the only lens I have for it is the 60mm macro. But I plan to rent the 300mm f4 lens locally and try it out. I would probably have bought this camera at the regular price, but there are some absolutely amazing discounts on both Amazon and particularly Adorama right now. Which is just icing on the cake. I am hoping to get good used copies of 3 more lenses (300mm f4, 12-100mm f4 and 40-150mm 2.8) to complete my kit during the various sales that are likely to be happening this week.
I want to thank everyone who chimed in with advice and suggestions. I really appreciate it. Cheers!