As of my knowledge cutoff date of September 2023, there was no official announcement from Royal Enfield regarding the launch date of the SG 650 motorcycle. However, there were rumours that Royal Enfield could launch a 650cc cruiser motorcycle based on the KX Concept showcased at EICMA 2022. It is possible that the SG 650 could be based on this concept.
It's important to note that motorcycle manufacturers often do not announce launch dates until closer to the actual launch, and plans can change due to various reasons such as supply chain issues, production delays, or market conditions. Therefore, it's best to keep an eye on Royal Enfield's official website and social media channels for any updates regarding the launch of SG 650.