The blue capped pipe doesn’t look big enough. I think toilets need 3” poppies, unless there some kind of power flush.
Also, a floor mounted toilet comes with a set rough-in distance from the back wall (like 8”, 12”, etc.) and is centered on the toilet fixture. So, measure from the back wall AND from the side wall to see if it will fit. If a floor mount toilet won’t work, you may need to find a wall-hung toilet and use a drain line in the wall, if there is one.
Likewise, a tub or shower have limited distances for rough-in too.
Generally the sink drain can be routed around and tie into the shower or toilet drain. You just need adequate wall space to mount the cabinets, etc.
The vent could be a problem if they have not extended something up through the roof. Look in the ceiling joist space for a 1 1/2” to 2” pipe that has been capped.