Daggerfall is a must!!! You'll get to see how it shaped Bethesda and the Elder Scrolls games that came after (including Morrowind)
Yeah, it’s on the list for when I can put 20+ hours a week into video games again without constant interruptions (kids, man, hahaha, I appreciate pick-up-and-put-down sorts of games so much more than I used to)
Yeah, Daggerfall really holds up well today. The game can be downloaded completely for free (truly gratis; no DLC, no ads) on Steam. Then using the official data files you'll get the best experience playing with Daggerfall Unity [2] which is a fanmade rewrite of the game engine on Unity. DFU fixes/avoids a lot of longstanding bugs in the base game, runs in high resolution, and has a long draw distance (which is a big deal since the in-game distances are VAST).
[1] https://store.steampowered.com/app/1812390/The_Elder_Scrolls...
[2] https://www.dfworkshop.net/daggerfall-unity-1-0-release/