Firstly, How would I get the bounding box of a circle SVG, I have only been able to get the rectangular shape around it and not the actual circle?

After this, how would I go about adding text to this circle based on its bounding box so it wraps and breaks nicely in the circle with no overlap outside of the shape? If this is not possible, are there any other potential ways in which I could get a text (of changing length) to sit within the bounds of an SVG circle?

Thank you for any help