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.

Invesco Growth and Income R5 (ACGQX Quick QuoteACGQX - Free Report) has a 0.49% expense ratio and 0.36% management fee. ACGQX is a Large Cap Blend fund, targeting companies with market caps of over $10 billion. These funds offer investors a stability, and are perfect for people with a "buy and hold" mindset. With yearly returns of 9.69% over the last five years, this fund clearly wins.

Fidelity Balanced Fund (FBALX Quick QuoteFBALX - Free Report) . Expense ratio: 0.5%. Management fee: 0.38%. FBALX is an Allocation Balanced mutual fund. Allocation Balanced funds look to invest across asset types, like stocks, bonds, and cash, and including precious metals or commodities is not unusual; these funds are mostly categorized by their respective asset allocation. This fund has managed to produce a robust 10.21% over the last five years.

Neuberger Berman Mid Cap Growth Investor (NMANX Quick QuoteNMANX - Free Report) : 0.85% expense ratio and 0.75% management fee. NMANX is a Mid Cap Growth mutual fund. These funds aim to target companies with a market capitalization between $2 billion and $10 billion that are also expected to exhibit more extensive growth opportunities for investors than their peers. With a five-year annual return of 9.17%, this fund is a well-diversified fund with a long track record of success.

There you have it. If your financial advisor had you put your money into any of our top-ranked funds, then they've got you covered. If not, you may need to talk.