T will be available to the muscles in days. Then they will respond in their own time. Whey shakes will help a lot and if you get a hunger that will not go away, could be protein hunger and whey shakes will make a difference.
Don't neglect the role of muscle recovery time.
Mental effects can take weeks as there are changes to the brain then changes in thought patterns and mood.
E2 can create problems and needs to be monitored and managed as required.
Your energy will increase, but low thyroid function can hold you down.