Yes, you can.
The Intelligent Investor funds (INIF, INES & IIGF) are listed on the ASX, and anyone with a brokerage account can buy units right now. The benefit of participating in the offer is not having to pay brokerage costs. Additionally, the units will be listed at NAV on the offer close date.
On market investors transact at the sell and buy price which is approximately one cent above the NAV.