Yes, you can take funds out of your SatrixNOW account at any time, provided the funds are not tied up in holding an ETF.
If the funds are available (ie. indicated as "Withdrawable Funds" on the platform) the withdrawal process takes approximately 2-3 business days depending on the financial institution you bank with.
For full details on "Withdrawable Funds" and how to withdraw them, please visit this FAQ article.