There is never a wrong time to invest in mutual funds for retirement. So, if you're still looking for the best mutual funds, the Zacks Mutual Fund Rank can be a great guide.

The best way to shortlist great mutual funds is to ensure solid performance, diversification, and low fees. Some are better than others, but utilizing the Zacks Mutual Fund Rank, we have identified three mutual funds that could be solid additions to one's retirement portfolio.

Let's learn about some of Zacks' highest ranked mutual funds with low fees you may want to consider.

Calvert Equity Portfolio I (CEYIX Quick QuoteCEYIX - Free Report) has a 0.65% expense ratio and 0.55% management fee. CEYIX is a Large Cap Growth mutual fund, and these funds invest in many large U.S. firms that are projected to grow at a faster rate than their large-cap peers. With yearly returns of 14.09% over the last five years, this fund clearly wins.

ProFunds Tech UltraSector Investor (TEPIX Quick QuoteTEPIX - Free Report) . Expense ratio: 1.48%. Management fee: 0.75%. TEPIX is a Sector - Tech mutual fund, allowing investors to own a stake in a notoriously volatile sector with a much more diversified approach. This fund has managed to produce a robust 16.65% over the last five years.

Arrow Managed Futures Strategy I (MFTNX Quick QuoteMFTNX - Free Report) : 1.27% expense ratio and 0.85% management fee. MFTNX is classified as an Allocation Balanced fund, which seeks to invest in a balance of asset types, like stocks, bonds, and cash, and including precious metals or commodities is not unusual. With a five-year annual return of 10.44%, this fund is a well-diversified fund with a long track record of success.

These examples highlight the fact that there are some astonishingly good mutual funds out there. If your advisor has you in the good ones, bravo! If not, you may need to have a talk.