Hey there, @Gyshuk, congrats on the upgrade! We see you're wondering if you're able to use your Quest 2 without a PC. We will happily answer this question for you! Our Quest 2 games do not require you to use a PC, it is completely optional.
If you have any other questions, please don't hesitate to reply back here! We're always happy to help.
All games in the Oculus Quest store (the one accessed via the headset when it's standalone) can be played without a PC. If you buy something from the Rift store (within the PC app or in the headset if you have connected the Link cable and enabled Link - it's confusing), you will need a PC, although many Quest and PCVR games come with free copies of the same game in the alternate store.
It's a bit like asking "can I buy Elden Ring on Steam and play the game on my phone?".
No, you cannot - at all.
The Quest 2 has an extremly slow phone gpu (Adreno 650, part of the XR2 SoC), so you're basically playing VR games on a phone.
If you want high-end VR games, like those on Steam or in the Meta Rift Store, you'll need a fast gaming rig - the faster the better. A gaming pc with a RTX 3060 Ti video card will be a great choice though - or something even faster. Unless you're happy with the very low-end phoneVR.
Valve Index & Oculus Rift CV1, Asus Strix OC RTX™ 3090, i9-10900K (5.3Ghz), 32GB 3200MHz, 8TB
"Ask not what VR can do for you, but what you can do for VR"