My iPhone 13 and Macbook Air M1 were seized due to a legal matter for investigation. I will soon gain custody of my devices and I have a few questions related to this.

1) How can I rule out any malware/spyware/virus planted in my devices? Like should I get an antivirus to scan? If yes, kindly suggest.

2) How can I download my complete data from iCloud, and devices to a USB? And if I do this, is there a possibility for any malware/spyware/virus to be downloaded as well?

Thank you.