It is best practice to review financial data regularly. It is up to you how often. The U.S. Small Business Association recommends reviewing data weekly.[i] This data should include profit and loss, balance sheet, cash flow statement, accounts receivable and accounts payable, and inventory. The purpose of doing regular reviews is to understand if you are collecting all the money, managing inventory well, and using the money in the bank wisely.
[i] “How Often Should Small Business Owners Review & Analyze ...,” n.d. https://www.sba.gov/sites/default/files/articles/9am_FinancialDisciplineSystem.pdf