How soon do I start looking for tenants?

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So I'm about 3 weeks from finishing my condo and making it available for lease.  Question is, is it normal practice to start posting ads out for it now, looking for tenants, having them fill out the rental app now, and even getting them in for a showing of the incomplete condo?  In other words, is it normal and acceptable to "hit the ground running" in this way, or is the accepted practice to have the apartment finished before starting the tenant search/screening/rental app process?  Thanks in advance!