https://www.flightglobal.com/business-aviation/the-magic-number-that-makes-electric-flight-viable/140050.article

A little over a year ago, Elon Musk waded into a Twitter conversation about electric aviation with the remark, “FWIW, based on calcs I did 10 years ago, cross-over point for Li-ion beating kerosene is ~400 Wh/kg. High cycle batteries are just 300 Wh/kg today, but probably exceed 400 in ~5 years.” This summer, he added: “400 Wh/kg *with* high cycle life, produced in volume (not just a lab) is not far. Probably 3 to 4 years.”

In Electrovaya's latest Presentation available on theri web page they say the new solid state preliminary numbers >350 WH/Kg.  So they are getting close.  How much greater than 350 Wh/Kg is still in the process of determination.