The MAP Tool from Microsoft has done well by me in the past. It gave me an inventory of all SQL Servers on my network and some decent reports including the info you mentioned. I haven't used it in a couple years and there have been new versions but unless it took a huge leap backward it should be able to get you what you need pretty quickly.

Microsoft Assessment and Planning (MAP) Toolkit for SQL Server 2012

PS I get that you have a deadline but down the line know that learning PowerShell is well worth your effort 😉