Hello,
Solution #1
What you can do is Initialize Variable > set the Expression to dayOfWeek(utcNow()) > use this variable in a Condition and say if the variable you set is (6 or 7) do something otherwise perform your functions.
The final result will look something like:
Solution #2
Go to Recurrence and change to 1 Week > select all weekdays
Then choose At these hours
Then choose At these minutes as 00,30
If this is helpful please accept answer.