How to determine from command line if NVMe slot is gen 3 or gen 4?

B550M Steel Legend m 2 4 0 in 3 0 slot 2 PCIE adapter ONLY supports PCI-E NVME based M Key , NOT supports any SATA based SSD Fit for PCIE x1x4 x8 x16 slot No driver m2_1 slot Slot Version

m2 expansion slot With PCIe Gen 5 SSDs becoming more available, we're going to look at the differences of Gen 4 vs Gen 5