I had a hummingbird crash-land onto my boat (tuna fishing) 70 miles offshore in a thick fog about 18 years ago. We tried to feed it sugar water and keep it warm, but it died. Your thread made me remember this.
There are lots of hummingbirds where I live. All of them began to "arrived" after many years of us planting flowering trees/shrubs/plants/grasses/etc. Now-a-days, we have so many types that I can't count them. My bees start to draw white comb before the hummingbirds show up each year, so ... I'd not wait for them: I'd listen to the bees. ... just my thoughts, based on my area observations.