I sold all my VTSAX yesterday, with the plan to re-buy VTI. Then last night happened. I now see people say to avoid buying at market open, but seems like today of all days the market is

I'm not an experienced investor, and am hoping someone with more experience can lend a hand. I sold all my shares yesterday - 100% VTSAX. I was going to be reinvesting my roth in either VTI or a TDF, and the IRA will be transferred to my employer held plan, but not immediately, so I was going to put it into VTI today. Before today I thought you could just buy/sell VTI whenever, but this morning all the posts I saw were that there's a lot of volatility in the mornings and that I should wait until mid-day.

Do I stand to lose a lot by just submitting a full order of VTI today?