That psu is also good but if you can get better while not costing as much as fortune then we don't think there's an issue for it.
DQ 850 M-V2L is decent psu but using with i9+3090 is kinda risky. 3090 is an power hungry card we usually suggest our client to opt for atleast 1000w incase 3090 is needed. Upto 3080 DQ 850 M-V2L is nice above that 1000w is necessary.