Thanks for the responses and thanks for watching the video!

I'm so proud of him.
I think Michael's way is the easiest method but as I am unable to touch Jimmy I had to use a different method. I used capturing and shaping but I'm going to write a more detailed post about the steps I used in the "Parrot Trick Training" sub-forum later in case it is of use to anyone else.
marie83 wrote:Harlie does a half bow/wing stretching thing which when I catch her doing it I say "pretty wings" and give her a treat but she hasn't yet caught on.
Do you use a clicker? It's possible to teach this behavior without a clicker but it would be far more difficult. A clicker is really useful for several reasons, especially with a trick like this.
1) A verbal cue has no meaning to the bird (at least at first) but if a bird has been conditioned that "click" means "treat" it is very motivated to work for clicks. If it's hearing a click when it lifts its wings it gets excited and will offer this behavior more frequently and over time will offer it repeatedly.
2) A clicker marks the precise moment the bird does the desired behavior. The bird isn't left wondering what it did to get a treat because it knows whatever its doing the very moment it heard the click is what is desired. (And admittedly in the video my timing on the click was too late).
This is extra useful in this case because this trick is (usually) a multi-step process that involves shaping. Jimmy first learned to lift his wings folded, and later learned to stretch them out.
3) A clicker bridges the time between the desired behavior and the treat. It takes a second or two to deliver the treat and if you deliver the treat
after the wing lift is over (without using a click to mark the lift) the bird might not understand why it's getting a treat. For all it knows it just got a treat for
lowering its wings, because that's the last thing that happened before it got a treat!
If you try to deliver the treat the instant it lifts its wings that's more clear but is also distracting because there's suddenly a hand in its face just as its doing the desired behavior which may interfere with learning.