Happy to see you here in the Community, @BeachandBarn.

Yes, as long as your MacBook's operating system meets the recommended system requirements, you can log in to your QuickBooks Online (QBO) account. Also, you'll want to make sure your MacBook is connected to the internet, and you're using the supported web browser.

Here's an article you can read to know the recommended operating systems and the supported web browsers: System requirements for QuickBooks Online, Accountant, Payroll, and QuickBooks Self-Employed.

As always, you can visit our QuickBooks Community help website if you need tips and related articles in the future.

Please touch base with me here for all of your QuickBooks needs, I'm always here to help. Thanks for dropping by, @BeachandBarn.