1
general::
Be sure of success; also, have achieved success. For example, Since he knows all the important people, John has it made, or Karen was accepted every place she applied? she has it made. [Colloquial; mid1900s]
American Heritage Idioms
2
general::
Phrase(s): have it made [and] have got it made
to have succeeded; to be set for life. • I have a good job and a nice little family. I have it made. • He’s really got it made since he won the lottery.
McGrawhill's American Idioms And Phrasal Verbs