Written in the 5th century BCE

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Except for a few passages in Aramaic, appearing mainly in the apocalyptic Book of Daniel, these scriptures were written originally in Hebrew during the period from 1200 to 100 bce. The Hebrew Bible probably reached its current form about the 2nd century ce
www.britannica.com/topic/Hebrew-Bible

"It indicates that the Kingdom of Israel already existed in the 10th century BCE and that at least some of the biblical texts were written hundreds of years before the dates presented in current research," said Gershon Galil, a professor of Biblical Studies at the University of Haifa in Israel, who deciphered the ancient text.
www.livescience.com/8008-bible-possibly-written-centuries-earlier-text-suggests.html


Epigrapher Christopher Rollston, Associate Professor of Northwest Semitic languages and literatures at the George Washington University.
www.biblicalarchaeology.org/daily/biblical-topics/hebrew-bible/when-was-the-hebrew-bible-written/


- the Hebrews existed as a "people" with a royal dynasty [Davidic] and indications of a temple (scroll down link)

The find by Petrie was called the “Merneptah Stele”[1] and is also known as the “Israel Stele.” It got its name from the fact that the main text on the stele commemorates the Egyptian Pharaoh Merneptah’s victory over the Libyans and their allies. In line 27 “Israel” is mentioned by name as one of the people groups who were conquered. What is significant is that in Egyptian hieroglyphics the determinative for “people” is used which indicates that there was a group of people who identified themselves by the name “Israel” in the 13th Century B.C.
crossexamined.org/was-the-old-testament-invented-during-the-babylonian-exile-the-answer-is-no/

The historical fact of the exile indicates there was a pre-exilic religious culture which was probably monothestic in nature

As British scholar, Simon J. Sherwin correctly observes, “…it is unlikely that the crisis of the exile in itself could have turned polytheistic Israelites into monotheists. This is as true for those who were nationalists and those who where not. In order to maintain a distinct national religious identity it only necessitates the worship of Yahweh, not the denial of all others.”[1]

The Date of Deuteronomy: Linch-pin of Old Testament Criticism. Part One - Gordon Wenham
biblicalstudies.org.uk/article_deut1_wenham.html