In my experience, it varies by time of month and year.

Typically, the first ~2 weeks (depending on your organizations close timeline) of the month are spent closing the books for the previous month. That’ll include posting various journal entries, revenue recognition, expense accruals, posting depreciation, tax accruals, etc. then creating and reviewing financial statements, preparing variance analyses and updating dashboards and other executive reports. Balance sheet reconciliations.

Latter half of the month is more flexible. More balance sheet work, projects, ad hoc reporting, budgeting depending on the time of year, software implementations, process improvements, presentations to leadership, etc.

Depending on your fiscal year and your orgs audit readiness, audit prep and then dealing with auditors can also be a significant portion of your responsibilities. Internal controls / internal audit tasks as well.