Can Kakashi still use Susanoo after losing his Sharingan?
No, he can't now.

During the battle with Kaguya, Obito lent Kakashi the full power of the Mangekyo Sharingan which gave him the ability to use Susanoo. But after the battle, Kakashi lost his Sharingan along with Susanoo. So, I don't think that Kakashi can use Susanoo after all.