Probably never given how broad the field of psychology is. The demarcation line probably runs somewhere through the field, but to separate the two sides between science and not science is an open problem. Hell, it cosmology and evolution also suffer from similar problems, but those fields are far less controversial.

I deserve the downvotes: of couse you can measure whatever you like and conduct a valid analysis of the data and that's science.

But given the extraordinary prominence of quackery in 20th century psychology and psychiatric medicine, including the grotesque over-application of psychiatric drugs to young people suffering from feelings that can and should be treated more traditionally, I do think it would be best to step back and completely excise the fields as they exist from what we call science, and start afresh.