All iPad models use USB-C now. The only caveat to that is that when they introduced the new iPad model with USB-C, they kept the old model as part of the line-up and that old model still has Lightning.
There’s some variation between them when it comes to software though - with custom USB drivers only being available for the M1 based iPads that are supported via USBDriverKit
I’ve got an iPad mini and what I really want is a USB oscilloscope that works with it