This model from Tomy comes fully assembled, so you won't have to put it together before you can drive it. It runs on AA batteries, so no waiting for it to charge.
From OnBuy
Tomy 42946 John Deere Johnny Tractor with 2 Button Remote Control
The product is available from £22.10 at international stores.
Luksusbaby.com
John Deere Remote Johnny Tractor