It's a waste of time if your goal is to play clubs and rock bands. Learn to Read!
There are several beginning bass books that explain the staff and the note placement and values. Forget tabs- that is a crutch. Once you can read basic stuff- find a note on the staff and play it in time, then write out a simple bass part- a great way to learn is to see what you are playing. Write out triads, too, in quarter notes. This will help you to see, notes, rhythm patterns, and riffs as a group, rather than individual notes- and this is the key to being a good reader.
Also, learn to read both bass and treble clefs- it's not hard to do, and is a big help when you get with other readers. I can sight transpose- a good thing to learn. I was playing Thursday and the leader lit into a jazz tune I didn't know. I didn't have the chart but I was able to read it off the Bb book.
PS
Get transcriptions of bass parts and read along with the recording. If you have Cubase or a similar program that will play back a midi file while displaying a score, use this to "connect" seeing with playing.