3 trillion is way too high and even conservative estimates say only about half of the economy is underground
Although, due to the immense popularity Imran Khan has, he will be very useful with getting that economy documented and convincing people to pay taxes, as they have a lot of trust in him. And during that time they can make a system to monitor people's tax payments and implement laws if not paid
That was purely one aspect of the negative social culture I mentioned that needs to be worked on, at the end of the day it's part of human nature so will take time to mend.
But overall it also has a lot of differing aspects and ideals which are different to India's and a positive for it.