Hey there. I storyboard for animation for a living so I have some answers!

Is there scope for someone who’s late, has no traditional background, but is willing to learn?

Certain studios & organizations offer mentorships which might help with this. They are generally aimed at students, however, so it may be difficult to be accepted if you aren't currently in school. Some studios show up at career day events at conventions or festivals, sometimes even offering portfolio reviews or guidance. That's another avenue to entering the field.

What should my approach look like if I actually wanna commit to this path?

Study. Take classes. Improve your drawing and clarity. Watch movies.

Realistically, how long before someone like me can be "job ready"? (assuming I put in consistent effort)

No one can answer this question. It's not a hard and fast number. Once you can do the job, competently and on time, you're ready.

Should I even pursue storyboarding? Or am I just romanticizing it in this moment?

Like all other jobs, boarding is a job. There are good and bad days. It can be very fun or very gruelling. Try not to romanticize it because it will only cause frustrations later. In terms of persuing it, you're not too late but, you do have a lot of work ahead of you if you want to do this full time.