The problem is probably is not the bus themselves. The traffic is so bad there during peak hours so bus will have to travel slowly.

Such a short distance walking will beat any car as long as the road is having a bad congestion.

Anyway, to find out which bus are coming and where they are, use the website to show the bus location you want to know.

https://myrapidbus.prasarana.com.my/kiosk

Type in the bus number and search, otherwise there will be too many bus icons to locate the one you want. The refresh is 30 seconds so you can easily estimate if the bus you need is coming or is too far away.