After surgery, healing can take a long time and after about 6-9 months things don't change a lot anymore.
Early corrective surgery can be considered after 3 months.
For that reason I would try non-surgical measures such as physiotherapy first for 6-9 months before considering corrective surgery.
For high-demand patients such as musicians treatment should be more intense with closer physiotherapy follow up and a lower threshold to operate to correct extensor lag.
However, it is important to understand that operations can have complications which can make things worse. For flexor tendon freeing procedures (=adhesiolysis) this includes stiffness, pain, nerve injury.
Patients should balance pros and cons of their current situation with the expected benefits and complication risks of surgery.