[Pollard]

Isn’t that what an opus is here? Final post?

[Enlightened1]

No that is not the definition of Opus. o·pus /ˈōpəs/ Learn to pronounce noun 1. MUSIC a separate composition or set of compositions by a particular composer, usually ordered by date of publication. "The Gambler was Prokofiev's sixth opera, despite its early opus number" 2. any artistic work, especially one on a large scale.

[Enlightened1]

Probably easier to read in the link,

https://www.google.com/search?sxsrf=ALeKk02imZ3sd3YU2smDq2GsOoDzSeGd_g%3A1591364925945&source=hp&ei=PU3aXvTlM4_v_QaHxL-YAw&q=opus+definition&oq=Opu&gs_lcp=CgZwc3ktYWIQAxgAMgQIIxAnMgoIABCxAxAUEIcCMgUIABCxAzIFCAAQsQMyCAgAELEDEJECMgoIABCxAxAUEIcCMgUIABCxAzICCAAyBQgAELEDMgUIABCxAzoFCAAQkQI6BwgAEBQQhwJQ2wlYwgxg8hVoAHAAeACAAWaIAfIBkgEDMi4xmAEAoAEBqgEHZ3dzLXdpeg&sclient=psy-ab