Orthodox Jews accept Rambam (Maimonides)'s 13 principles of the faith. Rambam taught that all his 13 principles can be derived from the Torah.
The 10th principle explicitly says that God is omniscient. The 1st principle "Belief in the existence of the Creator, who is perfect in every manner of existence and is the Primary Cause of all that exists" doesn't explicitly mention omnipotence but rather obviously entails it. (If God is not omnipotent, then God is not "perfect in every manner of existence" since God would not be perfect in power.)
https://www.chabad.org/library/article_cdo/aid/332555/jewish...
Whether or not the ancient Hebrews believed in divine omniscience and omnipotence is something that can be historically debated. But contemporary Orthodox Jews do.
(I'm not Jewish but I hope I've stated the Orthodox Jewish viewpoint accurately.)