Sorry but your PC specs are a bit too low for very good VR with a Quest 3s imho. Streaming VR takes a lot of PC power and with headsets like your Q3s they can use up an extra 10-20% of your GPU because of encoding requirements that dedicated VR headsets with a DisplayPort connection doesn’t need to do. I’d suggest a rtx4070 would be the minimum gpu for VR with msfs 2020. You may have been better off buying a dedicated vr headset like a good used Vive Pro or used Index.
You should still be able to get a decent result with most PCVR apps using either a usb3 link cable or wireless with Air Link, Virtual Desktop, or SteamLink. You’re probably best to learn how to use all these and see what works best for you.
Start up by getting less complex pcvr games working well before jumping into complex sims like msfs 2020. You may get ok results with msfs 2020 but your settings are all going to need to be mainly on the low side.
Hopefully you’ll find the thrill of VR immersion outweighs the so-so graphics. You may also want to consider less complex flight sims like Aerofly FS2. This would def run a lot better with your pc specs. I used to run this with an older pc with a gtx1080ti and it ran great. X-Plane 11 might also be a good alternative and also ran great with my gtx1080ti. Good luck mate and cheers.