How to calculate group delay and compensate it by zero padding?

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The filtered signal has a time shift. How can ı measure the group delay of the filter?
fs = 5000;
tiv=1/fs;
t = 0:tiv:0.05;
t1=2*pi*100*t;
t2=2*pi*500*t;
x = sin(t1)+0.7*cos(t2);
xn = x + 5.*randn(size(t));
d = designfilt('lowpassfir', 'PassbandFrequency', 500, ...
'StopbandFrequency', 600, ...
'PassbandRipple', 1, 'StopbandAttenuation', 100, ...
'SampleRate', fs);
y=filter(d,xn);
subplot(2,1,1);
plot(x); hold on; plot(y);

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