@shopnyc I am sorry. My previous post could have been clearer.
Yes, you have until the end of the month to check all your PO boxes and submit your invoice. If you do that, you will be paid in mid-April. There is a link to this year's payment schedule on the home page.
If you want to be paid and reimbursed on the next payment deadline (this Wednesday), the cut-off date to submit your invoice is tomorrow (Tuesday).
Since I renewed multiple PO boxes this month and already paid my credit card bill, I want to get reimbursed sooner rather than later. So, I finished checking the last of my PO boxes, shipped all the baby mail I received, and submitted my invoice today.
(I actually renewed the boxes on 3/2 because I had planned to finish checking all my boxes before the mid-March cut-off date. Then, my area kept getting hit by atmospheric rivers and bomb cyclones and I decided to take it easy.)