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 break down some of the mutual funds with the top Zacks Mutual Fund Rank and the lowest fees.

If you are looking to diversify your portfolio, consider Permanent Portfolio Permanent I (PRPFX). PRPFX 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. This fund is a winner, boasting an expense ratio of 0.79%, management fee of 0.77%, and a five-year annualized return track record of 10.84%.

Fidelity Advisor Stock Select Allocation Cap Z (FZAPX Quick QuoteFZAPX - Free Report) . Expense ratio: 0.46%. Management fee: 0.41%. FZAPX is a Large Cap Growth option; these mutual funds purchase stakes in numerous large U.S. companies that are expected to develop and grow at a faster rate than other large-cap stocks. This fund has managed to produce a robust 12.27% over the last five years.

JPMorgan Developed Intl Value R6 (JNVMX). Expense ratio: 0.59%. Management fee: 0.55%. Five year annual return: 17.09%. JNVMX is a Non US - Equity option, focusing their investments acoss emerging and developed markets, and can often extend across cap levels too.

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.