The first showing on a Saturday is always extremely crowded. You should stake out a viewing spot no less than 2 hours before the parade. Anywhere you can find space as close to Main Street frontage as possible will be a great spot.
If it’s this Saturday, you may want to allot more time. Given it’s a three day weekend for most, the park will be super crowded.
9:05 is a good guess, assuming nothing goes wrong, but it depends on where you’re at on mS. Closer to the exit = add five minutes.
BTW… the second showing of the parade usually gets no love by It’s A Small World, even on a weekend. My family was always more night owls, if yours is too it’s a better option. Come Sunday, most locals will hang around the parade and fireworks and take off when they’re over. Thus most attractions will have short wait in the closing hours. Far more valuable than rope drop IMO.