Looks like Nvidia is playing the prudent game and is not touching any smartphone chips before completing the ARM acquisition. Its current solution for Android and iOS devices is the GeForce Now cloud gaming service, allowing AMD and Samsung to be first to market with the upcoming Exynos SoC that integrates an RDNA2 GPU later this year.
https://www.notebookcheck.net/Nvidia-CEO-says-ARM-smartphone-chips-with-GeForce-GPUs-are-not-coming-any-time-soon-AMD-and-Samsung-can-get-the-edge-with-the-ucomping-RDNA2-powered-Exynos-SoC.542994.0.html
lol, maybe there won't be an advantage because mobile games are so optimized for Mali and Adreno.
OR may be that NVidia GPU power consumption is less than ideal for mobile...