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.

Here are the funds that have achieved the Zacks Mutual Fund Rank #1 (Strong Buy) and have low fees.

Transamerica Large Cap Value I (TWQIX) has a 0.63% expense ratio and 0.59% management fee. TWQIX is a Large Cap Value mutual fund, which invests in stocks with a market cap of $10 billion of more, but whose share prices do not reflect their intrinsic value. With yearly returns of 12.72% over the last five years, this fund clearly wins.

American Funds Fundamentl Invs F3 (FUNFX Quick QuoteFUNFX - Free Report) : 0.28% expense ratio and 0.24% management fee. FUNFX is part of the Large Cap Blend section, and these mutual funds most often invest in firms with a market capitalization of $10 billion or more. By investing in bigger companies, these funds offer more stability, and are often well-suited for investors with a "buy and hold" mindset. With yearly returns of 14.77% over the last five years, FUNFX is an effectively diversified fund with a long reputation of solidly positive performance.

T.Rowe Price Integrated Glb Eq I (TQGIX): 0.58% expense ratio and 0.53% management fee. TQGIX is a Global - Equity mutual fund. These funds invest in large markets like the U.S., Europe, and Japan, and operate with very few geographical limitations With a five-year annual return of 12.61%, 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.