A genuine AIBU (ie. not an opinion I am hoping everyone will share) and plea for people that have got through potty training to respond to.
If your child had almost no successes at weeing in the potty over day 1&2 (he managed it once; I think I asked him to sit), would you say they aren't ready? He has some pointers such as knowing when he's done a wee or poo but I would have expected more willingness to do it if he was truly ready. He's 2.8. I don't expect perfection but have you gone on to successfully train having all accidents and no successes on day 1?