You can check if it's your hub/bearing assembly easily. Jack up the front end, grab the tire at the 12 o'clock and 6 o'clock position and see if you can wiggle the tire back and forth.
If it does it's more than likely your hub/bearing assembly. Mine made the same noise you're talking about when mine was bad.
Your brakes might get sloppy if it gets real bad, mine did at least but I also drove mine till the wheel damn near fell off ha.
1993 XJ 2 door - weekend warrior
2008 Evo X - DD
!don't hug that tree...I'm about to run it over!