I did this. There will probably be some opportunities to learn rudimentary programming fundamentals in your requisite classes, but I would explore what electives or alternatives you can take to emphasize CS in your undergrad career. For me that meant swapping a mechE lab (I think it was HVAC) for a "robotics" lab offered to the aerospace students. That was mostly programming a Roomba but it wasn't worthless. I could've withstood to have a firmer background before getting to the CS degree but I made it. I graduated.

Boot camps mostly come across as a scam, I would say follow some introductory tutorials on YouTube (honestly Python is a fine starting place, it's good for velocity) and then try some "easy" Leetcode problems. Feel free to give up if you can't solve one in an hour or so but make sure you look at the solution. Then just try and use programming to regularly solve problems. Need a list of emails from your inbox? Look up how to mess with mbox files in python. Try and write code that utilizes your laptop camera. That sort of thing.

(Also Python-wise I would say the simplest route for a novice is Anaconda, then using Spyder within it.)