Occasional we’ll get a user asking for a feature which is only on the Current Channel.  Or a Microsoft Support Engineer tells us, or the user, “your issue is fixed in a later version.”

Waiting for the Semi-Annual Enterprise Channel isn’t an option in these cases.

This is how we upgrade an individual workstation to the current channel
UpgradeToCurrentChannel.bat:

setlocal
reg query HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\ClickToRun\Configuration\ /v CDNBaseUrl
if %errorlevel%==0 (goto SwitchChannel) else (goto End)
:SwitchChannel
reg add HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\ClickToRun\Configuration /v CDNBaseUrl /t REG_SZ /d "http://officecdn.microsoft.com/pr/492350f6-3a01-4f97-b9c0-c7c6ddf67d60" /f
reg delete HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\ClickToRun\Configuration /v UpdateUrl /f
reg delete HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\ClickToRun\Configuration /v UpdateToVersion /f
reg delete HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\ClickToRun\Updates /v UpdateToVersion /f
reg delete HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Office\16.0\Common\OfficeUpdate\ /f
"%CommonProgramFiles%\microsoft shared\ClickToRun\OfficeC2RClient.exe" /update user
:End
Endlocal

Some notes

The http://officecdn.microsoft sets the update channel you will to switch to.

References:
How to manage Office 365 ProPlus Channels for IT Pros
Update history for Microsoft 365 Apps (listed by date)