Type 1 PostScript is dead, and you can find them with Spotlight.
From the desktop (Finder) press Command+F . In the Search for: field, type lwfn .
The result will show every Type 1 PostScript outline font on all mounted drives. Such as this, where I only have a few.

Some of the results are obviously text or PDF files that simply have the text string lwfn in them. I know the first four shown here are T1 PS fonts, but don't know why they show as Unix and unknown file types.
But you can right click on any font item and choose Show in Enclosing Folder. Whatever opens will have at least two items in it. The T1 PS outline font shown in the results, and its matching suitcase of screen fonts, which is erroneously listed as a TrueType font.

The entire folder shown here can be deleted.
TrueType fonts are still okay. Even ancient ones. I have a set of TrueType fonts I purchased at the time Windows 3.1 was new in early 1992. I can still use them. Mac legacy TrueType suitcase fonts still do work. The system shows them with a Unix executable icon, while at the same type correctly marking the Kind as TrueType.
How long will these old, non-Unicode fonts continue to be supported? Unknown.