Interestingly, the enclosed cartridges are only about half full. This applies to all manufacturers and also to laser printers...

For the Pixma TS3750i (ink cartridge, colour), you can find drivers, software and manuals for various operating systems, including macOS, on the official Canon support site. The exact compatibility with macOS Tahoe (presumably you mean macOS Sonoma, as there is no macOS Tahoe) is not explicitly confirmed in the search results, but Canon usually offers suitable software for current Mac models, which also enables scanning via USB. With many current Canon models, you can install the software (Canon IJ Scanner Utility) and use it to scan directly via USB, provided the appropriate driver is available for your macOS. The mobile functions (AirPrint, apps) are not relevant for your scenario, as you are explicitly asking for USB connection and scanning via software. The following applies to the comparison models from other manufacturers (Brother, Epson, HP): Brother and Epson generally also offer suitable drivers and scanning software for macOS, while HP currently only provides Windows software according to your information. Conclusion: For the Pixma TS3750i, you should check the Canon support page to see whether suitable software is available for your specific macOS - this is common practice at Canon, but not guaranteed for every model and every macOS version. If you are unsure, we recommend asking Canon directly or searching the Community for experiences with your exact Mac model and macOS. The same applies to the other models mentioned: Brother and Epson usually offer macOS support, HP currently does not. If in doubt, always check the manufacturer's official support page.

Yes, you can print with this printer from your laptop using a USB cable. You do not need an internet connection as the connection is made directly via the USB cable.

Yes, it supports A4 paper. The printer handles plain paper sizes including A4, A5, B5, Letter, and Legal, along with photo paper sizes like 10x15cm and 13x18cm. Note: While the in-house data lists smaller photo paper sizes (10x15cm, 9x13cm), official specifications confirm A4 support for plain paper. For photo printing, borderless A4 is not explicitly listed, but custom sizes up to 215.9mm width (A4 is 210mm) are supported.

The printer comes with ink cartridges. The box contains everything you need to get started, including the FINE cartridges.