The noise is normal and not severe. Recordings without the noise have probably been processed.
You could solve RF noise (hum and possibly some hiss) using USB mic hiss/white noise - #16 by Gale_Andrews
You don’t say what type of computer it is. If it’s a laptop their USB ports often share the same interrupt so they receive noise from all USB peripherals. Laptops are sometimes quieter when on battery.
Gale