Hindu monuments probably existed then, but they've not survived, Maybe simply because they weren't built of stone. A number of images of recognizable Hindu deities and votive pillars have survived from about a hundred bce to two hundred ce. Hindu temple building started in earnest through the 5th century ce https://hanumanmandiradelaide.com.au/establishing-neem-karoli-baba-statue-at-hanuman-temple-south-australia/