You can expect anything. They don`t seem to follow any order nowadays. I got DM on ECAS both sides and then SA was received by my sponsor. Since then No AIP or landing invitation.
did you get your DM letter or that one was also not sent to you? In a
normal order, you should get letters confirming SA, AIP, DM, and landing appointment.
Anyway, don't worry about that, others have reported not getting them or getting them with a lot of delay. If you want to feel reassured, try reaching the call center to confirm you indeed have DM and in approximately how much time you can expect to receive an appointment from Montreal. But I'm sure you will get news soon.
Typically, from what others have posted, Montreal will send you a landing appointment letter 2 weeks before your appointment. In our case, it was quite long but I saw recently someone getting the landing letter 3 weeks after DM, landing 2 weeks later. So about half the time it took for us!.