It can get a bit confusing. Check this out:
So at 4K24Hz, you can get RGB or 4:4:4 only.
In your case (for your TV), I think the best option is 60Hz and Sync Playback to Display. Although Adjust Refresh Rate is sometimes needed to pass HDR metadata through (need to switch the mode sometimes; even if it’s the same mode to trigger the data to be sent through). Improvements being made here though.