Do I need to do tourist extension since my EP is still under review?

Your friend telling incorrect information to you. No matter whether someone's work pass is pending or DP is pending, he or she MUST HAVE valid visa to stay in Singapore.

DO NOT try to overstay here, it will lead to penalty and other implications which you will regret later.

Now, back to you question, why you need visa extension? It is always wise to stay in your home country and wait for your work pass approval. Once it's approved then enter Singapore with IPA letter.

If you are going to apply extension, you can through online but what would be your reason? Most likely your visa extension won't be granted. But, give a try. Good luck

Hi, surya2k, thanks a lot for this answer! I think under this situation, i would probably try to apply for an extension first. I am here is only because my relatives are here, i wanna get myself involved in this environment first. Otherwise, i might need to back home for a while...sigh. I thought the ep should be granted fast, since it has already 5 weeks more. I wish it can be granted next week! But only fingercross to that, i should still get prepared first..

Hi Mr @surya2k Ive been reading your advices to people seeking help and I really find them very informative and helpful thats why I also want to ask for advice about my situation right now.

I am from Philippines and I just finished my contract in Singapore and my pass just expired last 2 May 2019. I received a special visit pass for 30 days that will expire in 1 June. However , today, I went to batam Indonesia to visit my family before I go back philippines. I bought my ticket and my travel date to Philippines which   is on 9 June 2019 via Changi Airport and I will depart from batam Indonesia on the 9th June same date as my flight to Philippines. Would there be any problem when I enter Singapore on that day? Please your advice on this matter. Thank you.

Regards,
Jenine

I am not Surya, so I hope you accept my reply nevertheless:
There should be no problem to return just for a short transit on 9. June after staying out of Singapore for almost three  weeks. But just in case of any questions, bring along your onwards ticket and show it to the immigration officers on request.