When to send a follow-up email?

I sent a prospective email to an academic about joining their lab for a postdoc recently and they asked about my availability for a zoom call to discuss it, they initially responded fairly quickly I'd say within 24 hours. But due to timezones, it was early morning in the weekend for me so I then responded before 9am Monday morning as I didn't want it to be lost over the weekend. But I've yet to hear back now and I'm wondering if a few days is enough time for a follow up.

In their initial email, they suggested we'd chat this week and the application has a deadline period, which is why I'm more inclined to follow up this week than usual.