Since Magoo is eating, using the litterbox and drinking, I'd sit tight till his regular vet is available. Especially if he doesn't seem to be in any pain.

Is there any kind of "goo" coming out of the eye?? You might want to try putting a warm compress on it. Just a suggestion.

Come Magoo, we love you and your mama and are praying you're okay. Your Meowmie has had enough trauma to last a lifetime. Cut her some slack (j/k).

Keep us posted.