Go to Morningstar.com to download a set of bonds issued by your chosen firm (810; if there are fewer than 10 issued, then all of the outstanding bonds). Based on the bonds current YTM, calculate the average current yield.

https://markets.businessinsider.com/bonds/apple_incdl-notes_201313-23-bond-2023-us037833ak68

I found bonds at the website above, it opens up to one and there are 5 more at the bottom.