That would depend on when Judaism became monotheistic and when Zoroaster lived. No one takes the date 660 B.C. seriously anymore. Most scholars think Zoroaster lived between 1500-1000 B.C. That would make Him roughly a contemporary of Moses, maybe even Abraham.
Well let's remember that Moses is the one who led the Israelite's out of slavery in Egypt, then the Israelites wandered in the dessert for 40 years (punishment from God for worshipping the golden calf when Moses was on the mountain getting the 10 Commandments) and when the calf worshipping generation passed away (after 40 years) then Joshua (who took over after Moses died) started conquering small towns throughout Israel slowly over his lifetime until they had the Promised Land promised to them by God.
So, it was like almost 50 years between leaving Egypt and entering the promised land to start winning battles for land. Judaism was FOR SURE monotheistic after Moses returned with the 10 Commandments because Commandment 1 is that they worship only one God.
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