Jesus was fully human as well as fully divine. By virtue of His human nature, the literalist reading of “all” in Romans 3 should apply to Him.
Further, the extremely harsh language of Romans, which I cited, makes it difficult to say that it also applied, for example, to a number of Old Testament righteous, such as Noah.
On the other hand, to issue a sweeping condemnation of a race and pepper it with lawyerly exceptions “excepting Jesus, Mary, St. John the Baptist, Noah, Elijah, the Holy Innocents and all children before the age of reason” would be simply ineloquent. St. Paul implied the exceptions.
This is your conclusion.
Old Testament righteous, such as Noah
No one is righteous, nor can any one become righteous without the righteousness of Christ, that is what Paul is teaching in Romans.
St. Paul implied the exceptions.
This is your implication.