These are the types of snake with the most potent venom in the world according to worldatlas.com as of 7/22/2020 A.D. The link to my source is here: https://www.worldatlas.com/articles/which-are-the-most-venomous-snakes-in-the-world.html
Sorry, only saw this now. I can't remember the source when I posted the first comment, but I see the Wikipedia article sets out several sources on Boomslang venom and its toxicity. Hope this helps