Hello Vince and welcome to the family, so glad you decided to join us and we look forward to hearing more about you and Henry.
A month is just a time frame, it could happen sooner or take much longer, it depends on how quickly he gets comfortable with you to trust you and you have to earn that trust so be patient because it will happen but when he is ready for it.
He is a good looking grey from the pictures you so kindly shared with us, most of the time we have to ask for pics, he looks like they typical grey hanging down from the top of the cage.
You will find lots of useful information in our many threads so do read thru them and ask questions you may have and we will help you in any way we can.