Hello Kevin and welcome to our family.
Congrats on your new companion and you are off to a great start already, just continue to do what you are doing realizing it takes lots of time and patience on your part but what you will reap will be worth the wait.
You don't need to develop any particular schedule as far as feeding them, greys are foragers which means they eat all day long so its important they have food readily available at all times, a bowl with a good seed mix is necessary, maybe one for pellets and another for fresh food that will have to be replenished several times a day as it tends to spoil after a few hours. There is a thread in the bird food room that lists the safe vegetables and fruits to offer, vegetables should be provided every day and fruit only several times a week.
Greys tend to be more nervous than the other parrots and my grey is a little skittish herself so I know what you mean. Birds also don't see very well in the dark so having a little light on like a nightlight will help if she seems to panic in the darkness.
You are right to mostly observe Georgie and let him decide when he wants more interaction from you for you are trying to gain his trust and that must be earned, it takes time especially since he is over 20 years of age and he has a lot of baggage that may become more apparent as he settles into his new home so be prepared for any new behaviors to be revealed in the coming weeks and months.