There are many reasons for a Wikipedia reference-linkscoliosis and most people have a small degree of one so don't worry to much about it. Sounds like you are on the right course of assessment and management.

Let the therapist work out why it is there. Sometimes these are structural (bone) and mostly they are postural (muscular). Sometimes that resolve in sitting but appear in standing etc. A clear assessment will lead to a potential cause and a starting place.

It is likely that you have had this for many years though so it won't necessarily resolve over night. Consider you spine a life long journey as it's not unlike a car - if you don't look after it and service it regularly it isn't going to last that long.

Let us know how you get on at assessment