I don't have an iPhone can't I apply for an apple card on my MacBook Pro?

You can only apply online if you are buying something utilizing the monthly installment purchase program. Apply for Apple Card online when you buy a product with monthly installments - Apple Support

Yes you can. There is a new option to do that. See the details in Apply for Apple Card online when you buy a product with monthly installments - Apple Support

That is also true if you have an iPhone. It is currently an eligibility requirement for the Apple Card. See: How to apply for Apple Card - Apple Support

Thanks for the additional information.