Retirement planning

my wife and I are doing well compared with many I think but nonetheless I’d appreciate some advice.

my wife is 59 and I’m 52. we have investment assets of about 1.8M, and a house worth about 2.8M. I earn 230k pa and she contracts for about 200k a year. we still have a mortgage of $250k

She is sick of the grind and would like to retire. I’m not ready to retire and will probably continue till 60 perhaps longer. I’m worried (probably irrationally) that we won’t have sufficient funds to sustain a high quality retirement. should I be worried?