When bible says "heaven" does it refer to up physically or is it more deep than that as a metaphysical world?

In Christian belief, when we pray, "Let your will be done on earth as it is in heaven," does the word "heaven" refer to the metaphysical, Platonic realm that is beyond matter—like the domain of free will, spirits, angels, and souls of the deceased, a place beyond our universe that we cannot fully understand or access scientifically? Or does it refer to the physical sky, the heaven as we know it? What is the perspective of the Bible on this matter? And when bible says "ın the beginning God created the heaven and the earth" does 'earth' mean whole physical universe that we can understand with science and our senses or is it just the earth we know as a planet?

When bible says "heaven" does it refer to up physically or is it more deep than that as a metaphysical world?
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