I think you'd really be cutting it too close. Even if there's no line, it will still take about 10-15 minutes from the time you get in the library til the time you get off the ride and your spouse gets to go on. It's conceivable that you could both have ridden by 9:30, but seeing as you should really be in line for Playhouse Disney at least 15 minutes before (and for the (9:30 show people will have already been lined up since 9) and it's probably a 5-7 minute walk from ToT to PD, I just don't think you can make it.
I think your best option is to send one person to ToT for Fast Passes and then meet in line at Playhouse Disney for the 9:30 show. There's really no way to say how long the wait is for Fast Pass. They only give so many out for each time period, so the faster they are snatched up, the later the posted time is. But that early in the morning, you should have a relatively early return time (like between 10 and 11).
Have fun!