Typically, at roughly development of the 10th leaf (vegetative V10 stage), corn will start to develop tassels, and also "ear shoots" (on the sides; the higher ones up could develop into ears of corn).
The corn will continue to grow taller, and after V14 (14th leaf), will transition into the reproductive (R) stage. At the terminal vegetative (VT) stage, the tassels will be fully extended and all of the leaves that the plant will grow will be visible.
The first (R1) reproductive stage is when the silk starts emerging from the husks of the ear shoots. Hopefully by then the tassels you have are producing their pollen! Sweet corn is harvested at the R3 "milk stage", when fluids in the kernels have a milky texture.
My guess is that your corn is now somewhere from V10 to V14 in development, and will get taller.
I don't know how hot or dry it's been for your corn. If you are seeing very healthy plants, I still suspect there is some growing that will happen. Lack of water could certainly stunt corn, but I think that would not look like a healthy plant. Hot is sort of relative; many corn-producing regions routinely reach daytime high temperatures of 27 C to 33 C in June. If there are corn varieties adapted to cooler climates, and that is what you are growing, those varieties could react to temperature differently.