Does Windows Defender Antivirus and Windows Defender Firewall keep my laptop 100% secure?

Dear all

1. I have an offline laptop which I use as backup platform.

Before it went offline:
Windows fully updated
Windows Defender Antivirus and Real-time protection on
Windows Defender firewall on

I have only downloaded software from the Microsoft Store and never visited any websites.

I have done Full scan = clean

Can I trust, that my laptop / system is clean?

2. What version of Windows Defender Antivirus and Windows Defender firewall does a new laptop with pre-installed Windows 11 come with?
The newest versions?

Thank you