All your apps will show up in Mojave or Catalina. Be aware that not all 64-bit apps will work because some may be incompatible with either of those operating systems. That's why I suggested that you check out Roaring Apps to see if your favorites will work. Upgrading to Catalina automatically converts to APFS. If I recall correctly, Mojave does not guarantee it, but someone else will have to verify that.
