I got approved sept 21 and I got ss# today 26 and the approval noticed, my green card should be arriving by Thursday.

maybe 5-6 business day... however they will send you a usps tracking number.

I made the green card payment in aug haven't received ssn num yet,though it was done online through ds260. Is there a way to track ssn and green card?

you will see the tracking number of your green card in this app or in your uscis account...you can't not track the ssn card... you should receive it really soon after approval of you permanent residence