You'll be all but done with MD apps before you can even submit an SMP app.
A healthy med school app cycle starts with submitting AMCAS in June, and has secondaries completed well before the end of the summer. No way to predict when you'd get interviews, but they can be any time between July and March, maybe even April. Acceptances can come all the way into August.
A healthy SMP app cycle starts in about October, and it's considerably more convenient to do SMP apps with a completed AMCAS app in hand. Most SMPs don't do interviews, but you might get a phone call. Acceptances typically come January - August.
If you have the problem of losing an SMP deposit in favor of a med school acceptance, or losing a deposit in favor of a better school's acceptance (SMP or MD), drop to your knees and kiss the ground and sob a prayer of gratitude that this is a problem you have to deal with.
Assume that any given med school that hosts an SMP has 5000+ med school apps and 500+ SMP apps, and not enough time in the day to cross-reference.
Best of luck to you.