get-stat network script

I'm looking to use get-stat to get some network related info.  Here is what I need to do:

select a group of vms

for each vm, select only virtual network adapter 1 (vnic1) not vnic 2. (some vms have 2 or more vnics)

find the avg peak throughput in Mbps for that virtual network adapter only.  Make it as accurate as I can based on statistics level 1.   Peak of last 24 hours is OK. (I'd like to plan for the peaks)

Create a table such as below I can export to csv.

Ideas?

Thanks!