Hi,
First ensure that your Excel file is stored in an online location (Like Drive or SharePoint). Not sure how it works with an offline Excel file. Then, I would build something like this:

The Flow triggers daily at 8:00 AM now and runs a created script (similar to Excel Macro's).
You can either record the script yourself, or paste the code below in a new script.
function main(workbook: ExcelScript.Workbook) {
// Refresh all data connections
workbook.refreshAllDataConnections();
}
Both can be done via the "Automate" Tab in Excel (see highlighted below (even though in Dutch)):

After refreshing the data, the Flow will send an email to the email-address filled in.
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Regards,
Remco