Insider level Version Current Build Release Date
Monthly Channel (Targeted)
(formerly Insider Slow)
1804 9226.2082 April 17, 2018

Version Build Release Date Description
1804 9226.2082 April 17, 2018 Various fixes and improvements.

Source: Update history for Office Insider for Windows desktop - Office Support)

See also: Whats new for Office Insiders - Office Support