Automatically upload a file via FTP (for use with a scheduled CRON job)

GOAL: Using CRON, run a script at scheduled times. The script uploads the contents of a directory on the servers computer via FTP to another directory on another computer.

I have never used CRON before but setting up jobs in cPanel does not look that difficult. I have read dozens on posts (all 5-10 years old) on how to connect via FTP and put files. But none describe how to do this via cron.

From what I can gather, it would be simpler to create a script that does the connection/upload and just use CRON to run the file.

Here's what I have been able to write so far but am unsure how to turn this into a usable script file to run in CRON. I'm thinking a Php file?

Any help is appreciated.
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#!/bin/bash
HOST=ftp.pentagon.base.com
USER=pentagon
PASSWORD=`echo cGFzc3dvcmQ= | base64 --decode`

ftp -inv $HOST <<EOF
user $USER $PASSWORD
cd /public_html/uploads/base
mput *.xlsx
bye
EOF