Had Israel been completely set aside when this collection for the Jewish believers was happening?
No, Israel had not been completely set aside at that time. The Temple was still operating, Israel was still in the land, and the Jewish believers in Jerusalem were destitute, relying on the collection from Gentile believers. This shows Israel's national status had not yet been fully removed.
Les explains that as yet Israel had not been totally set aside. The Temple was still going, Israel was still in the land, and these Jewish believers were destitute because they had no welfare system. The Temple priesthood would not take care of them since they had embraced Jesus of Nazareth, whom the religious leaders detested. They were in an island of need, and their only hope was the collection from Gentile believers sent to Jerusalem. So the collection happened while Israel's national standing was not yet fully removed.