Hindu Monuments possible existed then, but they've not survived, Probably given that they were not developed of stone. A couple of images of recognizable Hindu deities and votive pillars have survived from about one hundred bce to two hundred ce. Hindu temple construction commenced in earnest with the 5th century https://hanumanmandiradelaide.com.au/shani-dev-temple-in-adelaide-a-sanctuary-of-faith-and-divine-blessings/