Every fund has a unit price that changes daily on business days. When you make a contribution to your chosen fund, you purchase units in the fund. The value of each unit is called the unit price, and it represents the value of the assets you have.
This same unit price also determines the overall value of your pension fund.
This means that your pension pot value is being updated every working day in the morning. If you look at your pension pot value on a Tuesday morning, for example, it would show you the closing unit price of the previous working day (in this case, Monday).