How do I get all my Iphone photos transferred to my MacBook Pro

Transfer photos and videos from your iPhone, iPad, or iPod touch to your Mac or PC - Apple Support

Are you using iCloud Photos? I highly recommend using iCloud Photos since any device signed into your iCloud account can view the photos.

To turn on iCloud photos, go to Settings > Your Name at the top > iCloud > Photos. Then just turn on the setting, I also recommend using the Optimizing iPhone Storage option if you have a lot of photos and extra iCloud space.