Hi there,
Yes you can get Windows 10 now. Mainstream support for Windows 10 will continue until Oct. 13, 2020, and extended support ends on Oct. 14, 2025. But both levels could well go beyond those dates, since previous OS versions have had their support end dates moved forward after service packs.
You can get it from here https://www.microsoft.com/en-us/software-download/windowsinsiderpreviewARM64
You can see this forum for more info https://techcommunity.microsoft.com/t5/windows-insider-program/i-can-t-download-windows-10-arm-insider-preview/m-p/2202750
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