Here are few commands that you can use to view info about BIOS on DELL computers:
List manufacture and version of BIOS
Get-WmiObject -Class Win32_BIOS | Select-Object Manufacturer, SMBIOSBIOSVersion
You can use the Win32_BIOS class to view some BIOS information on any computer running Windows. However, some hardware vendors provide special WMI classes to direct access BIOS from Windows OS (the native drivers by your hardware manufacturer must be installed on a computer)
Also, Dell released a separate PowerShell module, DellBIOSProvider, which is installed alongside driver installation or you can install it manually with this command:
Install-Module -Name DellBIOSProvider -Force
Install-Module -Name DellBIOSProvider -RequiredVersion 2.1.0
More info on this module you can find in PowerShell Gallery.
This module allows you to also modify some settings of the BIOS and you can easy build a script to export BIOS settings from computers and deploy same settings across all your computers.