How do I have my phones to the find my phone app for my Mac

If your iPhones are using the same Apple ID for iCloud and if they have Settings > [username] > Find My > Find My iPhone turned on they should appear in the Find My app on your Mac.

See Set up Find My on your iPhone, iPad, iPod touch, or Mac - Apple Support

When you enable "Find My" on your iPhone, you can locate it on your Mac by using Safari (or any other web browser) and going to: icloud.com. From there you would use the Find My app.

Ref: Use Find My iPhone on iCloud.com - Apple Support