Is it possible to send 2 or more o/p signal at the same time? I wanted run two motors using Cytron MDD10A Dual Channel motor driver. So my concern is based on execution of code that is done line by line, in that case when I'm driving two motors will this delay in output signal at the PWM pins make a difference in nature of performance i.e. for example a car wheel, in case there is such delay it'll cause one wheel to rotate prior to another which is not desired. If yes, how do I rectify the same.
I also wanted to know when I use the delay function does it cause the delay in execution of the previous line or reads the upcoming line upon some 'x' seconds of delay?
Thank you for your help.
edit: code sample:
void FWD() {       // to move forward
    digitalWrite(m1, HIGH);  // motor 1 ON 
    digitalWrite(m2, HIGH);  // motor 2 ON                           
    analogWrite(tm1, 225);   // tm1 assigned to a PWM pin
    analogWrite(tm2, 225);   // tm2 assigned to another PWM pin
} 

in the above function I wish to run both analogWrite at the same time as I'm not sure how will it affect the output? I wish for the motors to start at the same time.
Technically, it is possible to start two PWM outputs at the exact same
time on an Uno or Nano. If they are both controlled by the same timer,
you just have to update the corresponding control register once with
the relevant bits set to enable both channels. For example, you could
start outputs 5 and 6 simultaneously, as both are on Timer 0:
OCR0A   = value;  // set the duty cycle on OC0A = digital 6
OCR0B   = value;  // set the duty cycle on OC0B = digital 5
TCCR0A |= _BV(COM0A1) | _BV(COM0B1);  // enable both outputs

If the outputs are on different timers, it is a bit more tricky. Timers
0 and 1 can be synchronized by clearing their shared prescaler with the
Timer/Counter Synchronization mode active. I do not think there is a
simple way to synchronize Timer 2 with any of the others.
All this is highly hardware-dependent, and not supported at all by the
Arduino core library. Thus, if you want to apply any of this, you will
have to study the datasheet, and poke directly into the I/O
registers of the microcontroller.
But then, as Delta_G clearly points out in his answer, all this is
irrelevant to motor control. Motors are mechanical devices that have
significant inertia. They take time to speed up and slow down. Just to
give you a sense of scale, PWM outputs 3, 9, 10 and 11 deliver a square
wave with a period of 2.04 ms. Yes, those are milliseconds, and
this is too short for the motors to significantly change their speed
within one period. Contrast this with the handful of microseconds,
that the call to analogWrite() will take.