Invest $300K in covered call ETF and use dividends to pay off mortgage?

Hi I was wondering if following is a smart investment strategy: I got $300K from sale of property. Instead of making lump sum towards my current mortgage, I was wondering I can invest it ina covered call ETF, for example, HHIS which pays $0.27 dividend per share. At the selling price of HHIS, I will have 24095 shares which gives me $6500/ month. My mortgage is $3800/ month. I anticipate to keep the money for at least the next 20 years.