Are there any pending lawsuits only of these other subjects?
The Supreme Court doesn’t just sit around issuing decrees. They hear cases based on cases brought up from the lower courts. In rare cases they hear a case directly, but those are rare, and still involve someone filing suit.
So unless someone has brought a case to overturn homosexual marriage or interracial marriage, there will be no overturning such previous court cases.
Give them time. When they have this as a precedent then it would make their case stronger.