YES, it is possible to pick up the passport with visa stamp, one or two days after the interview (sometimes even the same day). It is given at the Chennai VFS office (NOT the Consulate). In fact the Consulate officer told my husband he could pick up the visa the next business day, at the VFS office. However, his interview was on Friday and train ticket on Saturday, so he got it by courier. You are lucky because your interview is on Monday, so it will be ready at VFS for pickup on Tuesday or Wednesday. Hope you can do that!