Exactly."The powers not delegated to the United States by the Constitution, nor prohibited by it to the States, are reserved to the States respectively, or to the people."
Amendment 10 of the United States Constitutionwww.usconstitution.net
Since the constitution never mentions or implies anything about abortion it is a state matter - as it always had been prior to 1973. Federal congress cannot legalize abortion or ban it for that matter or do anything about it.
I am glad that finally the SCOTUS ruled on our Constitution and did not legislate from their bench as was done when Roe v Wade was upheld.