It looked like Intel is going through some production problems with the 10 nm Cannon Lake chips, but the latest leaks involving Lenovo's IdeaPad 330 series powered by the Core i3-8121U CPU signals the fact that Intel will actually be the first to achieve the 10 nm milestone this year. Since the i3-8121U is an entry-level dual-core, the SiSoft Sandra results are not great, but still decent for a 4.5 W TDP CPU.
https://www.notebookcheck.net/Intel-Core-i3-8121U-SiSoft-Sandra-benchmarks-leaked-by-Lenovo.303616.0.html