Store this offline installer on a hidden partition of your deployment USB stick. You will thank yourself later when a network outage hits on a Monday morning.
You must first download the installation files on a computer with internet access before you can install them offline on another device. Microsoft Learn Use the Office offline installer - Microsoft Support office 2019 standard offline installer
Select your language and click to save an .img or .iso file. Critical Installation Details microsoft office 2019 standard offline - Microsoft Q&A Store this offline installer on a hidden partition
setup.exe /download configuration.xml
The offline installer is a self-contained folder. Unlike the streaming setup, this file set contains every .CAB file, DLL, and binary necessary to install the suite without touching the internet (except for activation). office 2019 standard offline installer