In one of our comments in the other thread, you state that some colleagues will log in on the weekend to get work done, how do you manage colleagues working more than they should?
During the week we track time using Harvest (https://www.getharvest.com/) and the next week we review the planned time vs. actual time spent on each project (and overall) and adjust the planning as necessary. It's not 100% precise, but it works most of the time.
Besides the planning vs. reviewing part, we're very open and encourage discussion on the remote work and with flexible schedule topic. Some team members have a lot of experience and some are doing this for the first time, so sharing is important. Having a routine is an important element into a good work-life balance.