How does a computer execute a software program?

Assuming the software program has been stored on the hard drive, the program is transported to the memory (RAM; random access memory). The CPU central processing unit then can grab the program from memory.

My question here is: what is this format of the program at this point? Is this human readable form or machine language?

- I learned that for Python and JavaScript, their runtime engine are also loaded into the memory. This engine activates when the CPU requests instructions, converts the human readable code to machine code and send it to CPU.

CPU then takes the instructions from the program and executed with the help of the motherboard.