Welcome from Northern Illinois! 4-6 weeks is the standard and always has been. OEM parts have always been pretty much non-existent expect for similar models from other makers like the PT1911 and PT92. Aftermarket parts such as sights, recoil springs and others have been made for very popular Taurus models.
The 4-6 weeks falls apart if THEY don't have the part. Then it's anybody's guess if the gun originated in Brazil. The guns now made in the USA should mitigate that issue with locally sourced parts.
Good luck with your gun, let us know how it works out. I've always used the chat feature, but hear that it's only available on a limited basis now which is too bad.