If there is no account review and the ad is approved (or eligible) and you are not getting any impressions even after the 3rd day, then pause the campaign (make no changes), wait for 4 to 6 hours and unpause the campaign, if after that again by the 3rd day you are not getting any impressions, pause the campaign and create a new campaign (which can be the exact same as the initial campaign) and usually this fixes such an issue, in my case.
Nonetheless, do check your keywords biddings, daily budget and also ensure that your campaign setup (keywords, ad headlines, ad descriptions) & landing page are ALL totally relevant to one another. So, for example, if your landing page is about desks, then let the landing page be ONLY about desks AND your keywords, ad headlines & ad descriptions need to be ONLY about desks : This will ensure that your setup is "seen" as optimized as per Google Ads algorithms and gives a better chance towards getting impressions and clicks, if incase the keywords biddings also are proper.