IIRC I've had emailed flight notifications for SQ?
In any event, you could always just go to googleflights and enter in the route and day. If your flight number still comes up at the same time no need to worry. (potentially much easier to enter into googleflights rather than log in to Kirs flyer etc etc)
If you have booked through SQ for flights on SQ, no need to worry about any ticketing issues. If you have booked through SQ for partner airlines, a slightly elevated concern in case the operating carrier changes or cancels flights.