Four phases of excavation have been completed and the fifth phase is underway.
According to wikipedia "The fourth phase of the excavation was conducted between 2017 and 2018, bringing out 5,820 artifacts. This phase was conducted by the Tamil Nadu Archaeology Department while the first three phases were conducted by the Archaeological Survey of India. Six carbon samples collected from the fourth phase of excavation at Keeladi were sent to Beta Analytic, Miami, Florida, USA for Accelerator Mass Spectrometry (AMS) dating. It was found that one sample collected at a depth of 353 cm goes back to 580 BCE. The graffiti marks on the artifacts obtained from the excavation site point to a link between the scripts of the Indus Valley Civilization and Tamil-Brahmi."
https://en.wikipedia.org/wiki/Keeladi_excavation_site
Source credit: https://en.wikipedia.org/wiki/Keeladi_excavation_site , Youtube