If and when I sauce, it is during the last 30-60 min. I usually just baste with a mixture of butter, honey and what ever rub I used.
I recommend the Smoke by Thermoworks. Costs about $100, but has decent BT range, remote display, easy to set alarm limits and probes last a long time. Inkbird IBTX4 is also ok, has 4 probes, will log (as long as connected), has an android app and I think a Iphone app.
I didn't like my Maverik, couldn't make alarm changes easily.