How to adjust delivery dates in Shopify linked to the Google Merchant Center?

  1. Yes that will be the case, but only for a short period (depending on how fast you are) If it was me, and I prepare everything, maybe 15 minutes.

  2. The only function you will not have is Product Studio, for the rest, GMC Classic has more features.

My recommendation, if you are concerned is to use a different app, which you can use with the current GMC Next version.