I’m working on informs someone you are doing something. It denotes your effort to complete the task.
Examples:
” I’m working on a new project. “
” I’m working uploading content on the website. “
” I’m working on a laptop. “
” I’m working on a film. “
” I’m working on a TV series. “
” I’m working on a Covid-19 vaccine. “
” I’m working on new album. “
” I’m working on new music. “
” I’m working on a ship. “
” I’m working on six projects at one time. “
” I’m working on autobiography. “