What do you mean by greatest and latest? Intel 3 is in high volume production, and Intel Xeon 6 chip, their datacenter offering, their bread and butter, are made on that process - [0]

18A is slated for 2025, not end of this year. Check this presentation from 2021 - [1]. Their latest update is that they are still on track - [2]

[0]-https://www.tomshardware.com/tech-industry/intel-3-3nm-class...

[1]- https://download.intel.com/newsroom/2021/client-computing/In...

[2] - https://community.intel.com/t5/Blogs/Intel-Foundry/Process-T...