Roll over

Hello momshies. Just wanna ask if it is normal if my baby doesn't roll over up to this time, he will be turning 6 months on March 04. I am just a little bit concerned kasi almost lahat ng kabatch nya ay nagroroll over na daw, according to theri mommies. But, as per my baby, ang napapansin ko naman sakanya is that, mas gusto nya na nakaupo sya or yung pinapatayo sya with support. Also kahapin, we just discovered na tuwang tuwa syang natuturuan maglakad, he slowly took his first baby steps yesterday. So just wanna ask sana if there are mommies out there who are in the same situation as mine? Or how many months does it took for your LO to roll over? Thank youuuu ?