In that He says, “A new covenant” He has made the first obsolete. Now what is becoming obsolete and growing old is ready to vanish away. (Hebrews 8:13 NKJV)
Was the Mosaic covenant nailed to the cross or was it only ready to vanish away? The Mosaic covenant ended with the destruction of God's Temple on Mt. Zion.
The new covenant with Israel and Judah has not been established yet.
The New Covenant is Jesus and his Gospel.