[FR] show file size and download speed

[DevliegereM]

PLEASE NOTE THAT FEATURE REQUESTS ARE ONLY CONSIDERED AGAINST v.28.0+

Is your feature request related to a problem? Please describe.
No problem.

Describe the solution you'd like
When downloading the InstallAssistant.pkg it would be nice to see how big the file size is and what the download speed is. This is to prevent users from complaining due to the filesize and the download speed. Currently nothing is shown and some of my users have a limited data plan.

Describe alternatives you've considered
No alternative but just a reminder that the download size is always around 15GB and can take a long while if you have slow download speeds.

Additional context

Screenshot attached shows how we implemented it currently in our script when upgrading to macOS 15.

[DevliegereM]

Code how we pull the information:
Download Size:

byteSize=$( ljt '0.size' "$workdir/mist-list.json" )
gigaByteSize=$( echo "$byteSize" | awk '{ split( "B KB MB GB TB PB EB ZB YB" , v ); s=1; while( $1>1024 && s<9 ){ $1/=1024; s++ } printf "%.2f %s", $1, v[s] }' )

Download Speed in Mbps:

networkQuality -s -v -c > /var/tmp/networkQuality.json
downloadSpeed=$( ljt 'dl_throughput' < "/var/tmp/networkQuality.json" )
mbps=$( echo "scale=2; ( $downloadSpeed / 1000000 )" | bc )
rm /var/tmp/networkQuality.json