Open Favourites Page in Safari with search bar text
If you just want to set the favourites as the home page, you can do this from Preferences → General: set ‘New windows open with’ and ‘New tabs open with’ to ‘Favorites’.

                     

There doesn't appear to be a URL to navigate to favourites. When I wrote my answer in your linked question, topsites:// went to the favourites page if that's what you had selected, but nowadays it doesn't and there doesn't seem to be a replacement.