How to filter for last working day in Jira JQL

We have a similar issue on Monday morning where we need to review issues created over the last friday and the weekend rather than just the past 24 hours. You can't test whether today is Monday, but you can infer it:

AND (
(created >= startOfDay("-3d") AND created < startOfDay("-2d") AND created >= startOfWeek("-2d") AND created < startOfWeek("-1d"))
OR
(created >= startOfDay("-2d") AND created < startOfDay("-1d") AND created >= startOfWeek("-1d") AND created < startOfWeek())
OR 
(created >= startOfDay("-1d") AND created < startOfDay() AND created >= startOfWeek() AND created < startOfWeek("+1d"))
OR
created >= -24.5h)

This basically includes things from Friday if Friday was 3 days ago, Saturday if Saturday was 2 days ago and Sunday was yesterday.

In your case you want to show where:

• duedate is today
• OR
• duedate is yesterday (startOfDay("-1d")...startOfDay()) AND duedate is between Mon-Thurs (startOfWeek("+1d") .. startOfWeek("+4d"))
• OR
• duedate is last Friday (startOfWeek("-2d")) AND duedate is 3 days ago/today is Monday (startOfDay("-3d")...startOfDay("-2d"))

Note: This assumes the default US locale where startOfWeek() is Sunday

duedate >= startOfDay() OR
(duedate >= startOfDay("-1d") AND duedate < startOfDay() AND duedate >= startOfWeek("+1d") AND duedate < startOfWeek("+4d")) OR
(duedate >= startOfWeek("-2d") AND duedate < startOfWeek("-1d") AND duedate >= startOfDay("-3d") AND duedate < startOfDay("-2d"))