FirstNet Capable 5G Device

I was looking to get the FirstNet ‘Responder Unlimited Connected Data Device w/ Tethering Plan’ and was curious if there was a 5G capable device available? The Max Transit 5G lists Band14 within specs but doesn’t specify FirstNet ready.
MAX Transit 5G

If you have a recommendation for FirstNet data plan/device please let me know, all information is greatly appreciated.
FirstNet Plans