The EOL of Windows 10 is October 25 so updates until then, but after that none, though it's uncertain if that includes virus definition updates to Defender as well.
I've built a new PC for my wife and could use one of the Windows 10 Pro retail licenses I have that was used on a PC that dies a couple of years ago. The license activation and so forth works just fine so far, but it was before registered as a digital license on the old PC.
In a few weeks I can deactivate my wife's Windows license and proceed with a new PC build for me.
So I've two PC's that worked for over 12 years before replacement and one that borked after 10. A good run, I'd say.
