Not a vet, but I would gently clean with soap and water first. Then apply a few drops of hydrogen peroxide. Then apply some triple antibiotic ointment with a cue tip. Careful with the peroxide because the cut is so close to his eyes.
Keep an eye out for signs of infection and take him to the vet on the first sign of any infection.
He should be fine. That cut doesn't look too bad to me.
Linus van Pelt Haus Juris CGC. My Sweet Babboo, born March 17, 2014.
Madeline Ronan Heart (Maddie) Dec 1997 -- November 22, 2013 Rescue GSD, Sable