I have the (older) "Performance Mouse MX" (which is still available for about $50).
It uses an internal rechargeable/removeable AA size battery that is recharged via a USB cable which plugs into the front of the mouse.
You can still use the mouse in "wired" mode while recharging.
Looks like the MX Master 2s may have gone back to a permanently-mounted internal batttery. But it still uses a USB cable for charging, and I'm sure the mouse will still be usable while doing so.
So... yes, you can use it "wired" if you wish.
Unless you really, really want the scroll wheel on the side, I'd suggest you consider the slightly older model -- mine is really nice.