cmdlet for target update version for a sql server

[sairam-yannam]

Hi Experts,
I'm a new to dbatools, just started to use it, I'm looking for a cmdlet or powershell script which - Provides information on the target update version for a specific set of SQL Server instances based on current and target SQL Server levels.

eg if my server is on build 14.0.3485, script or cmdlet should check the latest available sp, cu and provide the targeted version and also have an option to download.

I found a link which was not so useful, thought of asking in the community for help
https://www.powershellgallery.com/packages/dbatools/1.0.55/Content/internal%5Cfunctions%5CGet-SqlInstanceUpdate.ps1