We read in Genesis 2:3, “So God blessed the seventh day and made it holy, because God rested from all his work that he had done in creation.”
Did God rest? Yes. Was his rest a complete rest? Well, his rest from creation, yes.
I suggest, God kept working just not on creation.
Jesus said in John 5:17, “My Father is working until now, and I am working.”
This work is God working to glorify himself in creation and covering the earth with his glory like the seas cover the earth by the saving of souls.