Many of the new LG and Samsung TV's have Apple TV built into them and appear as an airplay device. If you buy one of those you can stream music from any apple device to the tv.
Also, if you're a completely apple ecosystem, you could just get a couple of apple homepods which sound amazing and are apple's version of a Sonos.
If you already have a hifi, you could add a second hand airport express (the square flat version not the powerbrick version and plug that into your stereo as it then makes the stereo an airplay device. On
Ebay those go for about £40-50.
I used to have a couple of thousand cd's but eventually took the time to rip them all in lossless format and put them on a NAS drive on my network and use an old iPad to control playing them through any or all of the music systems in the house. Add either a Spotify or Apple Music subscription and you've got pretty much all the music you could ever want.