I've only started one kit so far- but it was a winexpert kit with really good instructions and it did tell me what the s.g. was supposed to be. Still, there were no instructions on how to fix it if it was wrong, so I'm assuming that since it's a kit it is designed to be followed regardless of s.g. Maybe like a beer extract kit- no way to miss the s.g. anyway.
Still, most wines are in the 12-13% alcohol range except for the "Island Mist" kits which are lower and sweeter (like wine coolers, I guess). Most of my country wines are 1.085-1.100, and the valpollicella kit was 1.086. Does your kit have the finished ABV on it? Then we could guestimate from that.