They teach that they are declared righteous now but in a different way to how the anointed are declared righteous. What happens at the end of the 1,000 years is that the claim they then become children of God.
You can find more info on this link about them being children of God and being declared righteous.
https://wol.jw.org/en/wol/d/r1/lp-e/1200274276#h=15
Here is one reference about being declared righteous-
Watchtower 86 2/15
Concerning those with earthly life prospects, they are now declared righteous as to friendship with God, just as were Abraham, Rahab, and others of ancient times. During Christ’s Millennial Reign, they will gradually be raised to human perfection, so that after a final testing “the creation itself also will be set free from enslavement to corruption and have the glorious freedom of the children of God.” (Romans 8:19-21; James 2:21-26) Thus, obedient humans will be declared righteous for everlasting life on earth.—Compare John 10:10; Isaiah 9:7; 11:1-9; 35:1-6; 65:17-25.