Office 365 for Mac

Nope. Microsoft requires macOS Big Sur (11.*) or later to install any currently supported Office products (365, Office 2019/2021 for Mac).

Softmaker Office 2021 for Mac (Office clone/free trial) supports High Sierra and later. This might be an easier solution to use than the free LibreOffice (also Office clone). The latter will require macOS Mojave (10.14) to receive updates after Feb 2023, and will require Catalina (10.15.7) after August 2023 for updates.

See Microsoft’s system requirements. Microsoft 365 requires macOS 10.14 (Mojave)

System requirements and supported accounts

Microsoft no longer supports macOS High Sierra.

They no longer offer a version of Office that will run on it at all.