The Bible doesn't explicitly say the great crowd are in paradise. But their are scriptures that say what paradise will be like. And every scripture says the Earth is for man. Their is no reason to believe otherwise.
. 2 I also saw the holy city, New Jerusalem, coming down out of heaven from God
10 So he carried me away in the power of the spirit to a great and lofty mountain, and he showed me the holy city Jerusalem coming down out of heaven from God+
This can't happen if eveyone is in heaven.