Arduino Serial.print() if Weight is Steady - arduino

Question

I have a code in Arduino that runs a height and weight sensor combination with an ultrasonic sensor and load cells. I need the weights and heights to print to the serial monitor only when the weight has been steady on the scale for three seconds and the same for the height. What I mean by steady is that the weight or height would have to be the same for three seconds. Is this possible?
The code that I have for the circuit is as follows:
#include <LiquidCrystal.h>
#define calibration_factor -13180.00
//This value is obtained using the SparkFun_HX711_Calibration sketch
#define DOUT 7
#define CLK 6
HX711 scale(DOUT, CLK);
LiquidCrystal LCD(10, 9, 5, 4, 3, 2); //Create Liquid Crystal Object
called LCD
int trigPin=13; //Sensor Trip pin connected to Arduino pin 13
int echoPin=11; //Sensor Echo pin connected to Arduino pin 11
int myCounter=0; //declare your variable myCounter and set to 0
int servoControlPin=6; //Servo control line is connected to pin 6
float pingTime; //time for ping to travel from sensor to target and return
float targetDistance; //Distance to Target in inches
float speedOfSound=776.5; //Speed of sound in miles per hour when temp is 77 degrees.
void setup() {
Serial.begin(9600);
Serial.println("HX711 scale demo");
scale.set_scale(calibration_factor); //This value is obtained by
using the SparkFun_HX711_Calibration sketch
scale.tare(); //Assuming there is no weight on the scale at start up, reset the scale to 0
Serial.println("Readings:");
pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);
LCD.begin(16,2); //Tell Arduino to start your 16 column 2 row LCD
LCD.setCursor(0,0); //Set LCD cursor to upper left corner, column 0, row 0
LCD.print("Target Distance:");
}
void loop() {
Serial.println("Reading: ");
Serial.print(scale.get_units(), 1); //scale.get_units() returns a float
Serial.print(" lbs"); //You can change this to kg but you'll need to refactor the calibration_factor
Serial.println();
digitalWrite(trigPin, LOW); //Set trigger pin low
delayMicroseconds(2000); //Let signal settle
digitalWrite(trigPin, HIGH); //Set trigPin high
delayMicroseconds(15); //Delay in high state
digitalWrite(trigPin, LOW); //ping has now been sent
delayMicroseconds(10); //Delay in high state
pingTime = pulseIn(echoPin, HIGH); //pingTime is presented in microceconds
pingTime=pingTime/1000000; //convert pingTime to seconds by dividing by 1000000 (microseconds in a second)
pingTime=pingTime/3600; //convert pingtime to hourse by dividing by 3600 (seconds in an hour)
targetDistance= speedOfSound * pingTime; //This will be in miles, since speed of sound was miles per hour
targetDistance=targetDistance/2; //Remember ping travels to target and back from target, so you must divide by 2 for actual target distance.
targetDistance= targetDistance*63360; //Convert miles to inches by multipling by 63360 (inches per mile)
LCD.setCursor(0,1); //Set cursor to first column of second row
LCD.print(" "); //Print blanks to clear the row
LCD.setCursor(0,1); //Set Cursor again to first column of second row
LCD.print(targetDistance); //Print measured distance
LCD.print(" inches"); //Print your units.
delay(250); //pause to let things settle
Serial.print(targetDistance);
Serial.println();
Serial.print(" inches ");
delay(250);
}