If the transactions were in QBSE already and fail to show up today, you may update your bank manually. This is to ensure that your bank data are up-to-date.
To do that:
Go to Gear icon at the top.
Choose Bank Account.
Click Refresh On.
However, if you need more than 90 days of transactions, you can export additional historical transactions from the bank and upload them into your QuickBooks company. To do that, please refer to the steps found in this article: Manually add transactions in QuickBooks Self-Employed.
Keep me posted if you have additional questions about bank transactions in QBSE. I'll be around to help. Take care!