Yes! Recording information is completely different than publishing information, so this additional data helps better connect your songs to the royalties they are generating around the world.
If you're distributing your music through an online service like CD Baby – rather than being released on a third-party record label – you will still be assigned an ISRC and some other helpful details. If you're having trouble locating them, contact your distributor directly, and they would be happy to provide them to you.
Be sure to add these to all songs you register!