SanMax appears to be the first RAM producer to ready DDR5 modules for laptops and mini PCs. Unfortunately, these feature the default DDR5-4800 specs with CL 40 latencies, which is what most out-of-the-box laptop configurations will feature, so not exactly upgrade material. However, these modules can be used to build mini PC rigs.
https://www.notebookcheck.net/SanMax-showcases-DDR5-RAM-modules-for-notebooks-and-mini-PCs.568237.0.html