let arr = [{timestamp: 1604576031051, text: "vdsv", datetime: "2020-11-05 | 13:33:51"}, {timestamp: 1604576042065, text: "vsdv", datetime: "2020-11-05 | 13:34:02"},{timestamp: 1604576625433, text: "vdsvsd", datetime: "2020-11-05 | 13:43:45"}, {timestamp: 1604579744733, text: "мв", datetime: "2020-11-05 | 14:35:44"}, {timestamp: 1604579755705, text: "мівм", datetime: "2020-11-05 | 14:35:55"}];
let arr2 = arr.sort((a, b) => b.timestamp - a.timestamp)
console.log(arr2)