Multi-Servo rotation

hello trying make multiple servo motors rotate 0 90 degrees @ same time. using motor shield enables me rotate multiple ones external power source no problems getting them rotate. issue current code using enables motors rotate 1 after other. want them rotate in unison. please me figure out how write code enables motors rotate @ same time?

#include <servo.h>
 
servo myservo1;
servo myservo2;
servo myservo3;
servo myservo4;


void setup()
{
  myservo1.attach(0);
  myservo2.attach(2);
  myservo3.attach(4);
  myservo4.attach(6);
}
 
void loop()
{
    myservo1.write(0);
    delay(1000);

    myservo1.write(90);
    delay(1000);

    myservo2.write(0);
    delay(1000);

    myservo2.write(90);
    delay(1000);
   
    myservo3.write(0);
    delay(1000);

    myservo3.write(90);
    delay(1000);

    myservo4.write(0);
    delay(1000);

    myservo4.write(90);
    delay(1000);
    }

yup, you've got delay.  you've written says move servo 1 0, go coma second, move servo 1 90, go coma second...

look @ "blink without delay" example inspiration on how handle timing without using delay.

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