where transmision deepstick on a 2011 tundra 4.6 engine please help

Probably doesn't have one. Sealed system. Fill and drain plugs down on transmission. Somewhat more difficult to change and check fluid. Toyota says lifetime fluid. No fluid is lifetime! They want you to have to take it to them.

Yeah, Toyota has a Sealed Transmission so there's no way to check it unless you take it to a mechanic or the dealership.

You can do this without taking it to a dealership. You have to know what you are doing and understand transmission fluid levels and expansion of the fluid. I have one and have changed mine out. It is easy.