Scar healing/fading will vary from person to person.
You could probably predict where you will fall on the scale by how YOU healed historically.
I am on the far end of the scale of slow/bad healing/fading. I am 2+ years out from surgery and my scars are still pretty dark. They have faded somewhat from the early months (and at least now they are flat!) but they are still very noticeable (see pic below...the scars pointed at by red arrows are my WLS incision scars which are 2 years, 2 months old. My belly button is also healing from scarring from plastics 1 year ago.)
Generally though, for ALL scar care, it is often recommended to keep them clean and dry while healing, and then moisturize often when they close. Also, it's recommended to reduce alcohol during healing (as it may act as a blood thinner and prevent clots), and refrain from smoking (as it may affect healing as well: stress on heart, de-oxygenates blood, etc, etc...). Further, there has been some evidence of Retinol and Vitamin E topical applications to help by stimulating collagen growth which reduces the appearance of skin imperfections....
Edited to add: Just remembered! For really bad scars, I can vouch for steroid shots. I had some applied to the arm lift scars on my arm a few weeks ago and they have visibly improved. Still not to the level of near-invisibility like i've seen on others (i'm looking at you @sillykitty), but def much better than before.