You can check it here: https://www.upwork.com/earnings-history
Details: hsupport.upwork.com/hc/en-us/articles/211063698-Weekly-Billing-Cycle
Delayed Payments
During the security period, the amount paid to you appears as Pending on your Transactions page.
Each payment lists the date we expect it to be available.
If your funds don’t become available on the due date shown on your Transactions report, there is a problem with the payment (such as a failed card) and it’ll remain pending until your client resolves the problem.