My advice is to manage remote workers by focusing on accomplishments, outcomes, and goals rather than just workflow. Of course, you still need to put place those processes — repeatable processes are the key to continuous improvement. But micromanagement of off-site personnel will hamper productivity.
Plan for remote interactions at the outset: email, texts, conference calls, slack or other chat services. One difference between face-to-face communication and communication via email and chat is that it is difficult to determine a person's intent from electronic communication because there is no tone or facial expression to provide context. When face-to-face, you are absorbing body language and facial expression. Humans understand a lot from those cues — as much or more than verbally.
Both employees and managers should resist the impulse to overanalyze every word in every message and to read negative intent into brief replies.
Pro tip: set office hours a few days a month when everyone is in the same place at the same time — overlapping time zone differences.
Finally, by cognizant of the need to intentional facilitate productivity boosts through trust, as well as cultivating opportunities for personal interaction.